The US-backed Syrian Democratic Forces has said it will co-ordinate with Syrian government troops to fend off any Turkish invasion of the north.
An SDF commander has said Damascus should use its air defence systems against Turkish planes.
Turkey has vowed a new offensive on parts of northern Syria controlled by the SDF, a Kurdish-led armed alliance that is led by the Kurdish People's Protection Units, or YPG.
The new threats have highlighted the complex web of ties in northern Syria.
Although Turkey considers the YPG a terrorist organisation, Syrian Kurdish forces are backed by Washington and have also co-ordinated with Syria's government and its ally Russia.
SDF head Mazloum Abdi said on Sunday that his forces were open to working with Syrian troops to fight off Turkey but said there was no need to send additional manpower.
"The essential thing that the Syrian army could do to defend Syrian territory would be use air defence systems against Turkish planes," Mr Abdi said.
'Crimes against humanity'
Syria regards Turkey as an occupying force in its north and the foreign ministry in Damascus said last month it would consider any new Turkish incursions as "war crimes and crimes against humanity".
Turkey has backed rebel groups in clashes against Syrian President Bashar Al Assad's forces and the SDF. It has used warplanes and drones to strike territory held by the SDF, where the Syrian-Kurdish authorities have set up an administration separate from Damascus.
Mr Abdi said more military co-ordination with Damascus would not threaten this autonomy.
"Our priority is defending Syrian territory, and no one should think about taking advantage of that situation to make gains on the ground," he said.
Turkish President Tayyip Erdogan has promised to capture the SDF-held towns of Tal Rifaat and Manbij in Syria's northern Aleppo province, most of which is otherwise held by Syrian government troops.
Turkish-backed incursions in previous years have ousted the SDF from the north-western enclave of Afrin and a series of border towns further east.
Mr Abdi said a new offensive would displace about one million people and lead to wider zones of fighting, but would not confirm whether the SDF would respond with attacks inside Turkish territory.
He warned it could also lead to a resurgence of ISIS, which the SDF pushed out from territory in northern and eastern Syria with US air support.
SDF fighters guard camps and prisons where ISIS fighters and affiliated families are detained. Sending those guards to fight Turkey could leave security gaps.
"We cannot fight on two fronts," Mr Abdi said.
He said he hoped a coming meeting between the foreign ministers of Russia and Turkey could lead to de-escalation but said any negotiated settlement must include a halt to Turkish drone attacks in northern Syria.
"This would be one of our essential demands," he said.
First Person
Richard Flanagan
Chatto & Windus
Pros%20and%20cons%20of%20BNPL
%3Cp%3E%3Cstrong%3EPros%3C%2Fstrong%3E%0D%3C%2Fp%3E%0A%3Cul%3E%0A%3Cli%3EEasy%20to%20use%20and%20require%20less%20rigorous%20credit%20checks%20than%20traditional%20credit%20options%0D%3C%2Fli%3E%0A%3Cli%3EOffers%20the%20ability%20to%20spread%20the%20cost%20of%20purchases%20over%20time%2C%20often%20interest-free%0D%3C%2Fli%3E%0A%3Cli%3EConvenient%20and%20can%20be%20integrated%20directly%20into%20the%20checkout%20process%2C%20useful%20for%20online%20shopping%0D%3C%2Fli%3E%0A%3Cli%3EHelps%20facilitate%20cash%20flow%20planning%20when%20used%20wisely%0D%3C%2Fli%3E%0A%3C%2Ful%3E%0A%3Cp%3E%3Cstrong%3ECons%3C%2Fstrong%3E%3C%2Fp%3E%0A%3Cul%3E%0A%3Cli%3EThe%20ease%20of%20making%20purchases%20can%20lead%20to%20overspending%20and%20accumulation%20of%20debt%0D%3C%2Fli%3E%0A%3Cli%3EMissing%20payments%20can%20result%20in%20hefty%20fees%20and%2C%20in%20some%20cases%2C%20high%20interest%20rates%20after%20an%20initial%20interest-free%20period%0D%3C%2Fli%3E%0A%3Cli%3EFailure%20to%20make%20payments%20can%20impact%20credit%20score%20negatively%0D%3C%2Fli%3E%0A%3Cli%3ERefunds%20can%20be%20complicated%20and%20delayed%0D%3C%2Fli%3E%0A%3C%2Ful%3E%0A%3Cp%3E%3Cem%3ECourtesy%3A%20Carol%20Glynn%3C%2Fem%3E%3C%2Fp%3E%0A
MATCH INFO
Southampton 0
Manchester City 1 (Sterling 16')
Man of the match: Kevin de Bruyne (Manchester City)
MATCH INFO
Uefa Champions League semi-finals, first leg
Liverpool v Roma
When: April 24, 10.45pm kick-off (UAE)
Where: Anfield, Liverpool
Live: BeIN Sports HD
Second leg: May 2, Stadio Olimpico, Rome
AUSTRALIA SQUAD
Aaron Finch, Matt Renshaw, Brendan Doggett, Michael Neser, Usman Khawaja, Shaun Marsh, Mitchell Marsh, Tim Paine (captain), Travis Head, Marnus Labuschagne, Nathan Lyon, Jon Holland, Ashton Agar, Mitchell Starc, Peter Siddle
liverpool youngsters
Ki-Jana Hoever
The only one of this squad to have scored for Liverpool, the versatile Dutchman impressed on his debut at Wolves in January. He can play right-back, centre-back or in midfield.
Herbie Kane
Not the most prominent H Kane in English football but a 21-year-old Bristolian who had a fine season on loan at Doncaster last year. He is an all-action midfielder.
Luis Longstaff
Signed from Newcastle but no relation to United’s brothers Sean and Matty, Luis is a winger. An England Under-16 international, he helped Liverpool win the FA Youth Cup last season.
Yasser Larouci
An 18-year-old Algerian-born winger who can also play as a left-back, Larouci did well on Liverpool’s pre-season tour until an awful tackle by a Sevilla player injured him.
Adam Lewis
Steven Gerrard is a fan of his fellow Scouser, who has been on Liverpool’s books since he was in the Under-6s, Lewis was a midfielder, but has been converted into a left-back.
The biog
Occupation: Key marker and auto electrician
Hometown: Ghazala, Syria
Date of arrival in Abu Dhabi: May 15, 1978
Family: 11 siblings, a wife, three sons and one daughter
Favourite place in UAE: Abu Dhabi
Favourite hobby: I like to do a mix of things, like listening to poetry for example.
Favourite Syrian artist: Sabah Fakhri, a tenor from Aleppo
Favourite food: fresh fish
Match info
Huddersfield Town 0
Chelsea 3
Kante (34'), Jorginho (45' pen), Pedro (80')
SERIE A FIXTURES
Saturday Spezia v Lazio (6pm), Juventus v Torino (9pm), Inter Milan v Bologna (7.45pm)
Sunday Verona v Cagliari (3.30pm), Parma v Benevento, AS Roma v Sassuolo, Udinese v Atalanta (all 6pm), Crotone v Napoli (9pm), Sampdoria v AC Milan (11.45pm)
Monday Fiorentina v Genoa (11.45pm)
COMPANY%20PROFILE
%3Cp%3E%3Cstrong%3EName%3A%3C%2Fstrong%3E%20Carzaty%2C%20now%20Kavak%3Cbr%3E%3Cstrong%3EBased%3A%3C%2Fstrong%3E%20Dubai%3Cbr%3E%3Cstrong%3ELaunch%20year%3A%20%3C%2Fstrong%3ECarzaty%20launched%20in%202018%2C%20Kavak%20in%20the%20GCC%20launched%20in%202022%3Cbr%3E%3Cstrong%3ENumber%20of%20employees%3A%3C%2Fstrong%3E%20140%3Cbr%3E%3Cstrong%3ESector%3A%3C%2Fstrong%3E%20Automotive%3Cbr%3E%3Cstrong%3EFunding%3A%20%3C%2Fstrong%3ECarzaty%20raised%20%246m%20in%20equity%20and%20%244m%20in%20debt%3B%20Kavak%20plans%20%24130m%20investment%20in%20the%20GCC%3C%2Fp%3E%0A
UAE currency: the story behind the money in your pockets
ARSENAL IN 1977
Feb 05 Arsenal 0-0 Sunderland
Feb 12 Manchester City 1-0 Arsenal
Feb 15 Middlesbrough 3-0 Arsenal
Feb 19 Arsenal 2-3 West Ham
Feb 26 Middlesbrough 4-1 Arsenal (FA Cup)
Mar 01 Everton 2-1 Arsenal
Mar 05 Arsenal 1-4 ipswich
March 08 Arsenal 1-2 West Brom
Mar 12 QPR 2-1 Arsenal
Mar 23 Stoke 1-1 Arsenal
Apr 02 Arsenal 3-0 Leicester
Al Jazira's foreign quartet for 2017/18
Romarinho, Brazil
Lassana Diarra, France
Sardor Rashidov, Uzbekistan
Mbark Boussoufa, Morocco