Premier League chiefs have warned fans to avoid "excessive singing" and hugging as supporters returned to English top-flight matches for the first time since March on Saturday.
England's coronavirus restrictions have seen fans banned from sporting venues until now.
On Saturday, West Ham were set to become the first to host a top-flight match with spectators present in their clash with Manchester United.
Government restrictions mean just 2,000 fans will be allowed to watch the match at the London Stadium.
Chelsea's game against Leeds at Stamford Bridge, will also have 2,000 fans present.
The Premier League issued advice on safety measures on Saturday, including a warning for fans not to get carried away when their team scores a goal.
"Fans can celebrate but should remain socially distanced from people outside their social bubble," said the advice.
"Hugging of other fans and high-fives should be avoided and fans are asked to be respectful to those around them, including avoiding excessive shouting or singing."
The statement from the Premier League said clubs had missed the presence of fans, who have been absent since the coronavirus shutdown in March.
Supporters have to complete a health questionnaire and face temperature checks at the ground. They also have to wear face coverings.
Fans will sit in socially distanced seats, except for families or "household bubbles".
London and Liverpool are among the areas to have been placed into England's Tier-2 category based on Covid-19 rates, meaning up to 2,000 fans will be able to attend matches.
But clubs based in Tier-3 areas, such as Manchester and Birmingham, which have a higher number of cases, are still not allowed to open their gates.
Earlier, Arsenal manager Mikel Arteta praised returning supporters for making a "huge difference" to his team as they eased to a Europa League victory over Rapid Vienna.
Two-thousand fans were in attendance at the Emirates Stadium for the first time in nine months and witnessed the Gunners storm to a 4-1 win.
The President's Cake
Director: Hasan Hadi
Starring: Baneen Ahmad Nayyef, Waheed Thabet Khreibat, Sajad Mohamad Qasem
Rating: 4/5
The specs
Engine: 2x201bhp AC Permanent-magnetic electric
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The full list of 2020 Brit Award nominees (winners in bold):
British group
Coldplay
Foals
Bring me the Horizon
D-Block Europe
Bastille
British Female
Mabel
Freya Ridings
FKA Twigs
Charli xcx
Mahalia
British male
Harry Styles
Lewis Capaldi
Dave
Michael Kiwanuka
Stormzy
Best new artist
Aitch
Lewis Capaldi
Dave
Mabel
Sam Fender
Best song
Ed Sheeran and Justin Bieber - I Don’t Care
Mabel - Don’t Call Me Up
Calvin Harrison and Rag’n’Bone Man - Giant
Dave - Location
Mark Ronson feat. Miley Cyrus - Nothing Breaks Like A Heart
AJ Tracey - Ladbroke Grove
Lewis Capaldi - Someone you Loved
Tom Walker - Just You and I
Sam Smith and Normani - Dancing with a Stranger
Stormzy - Vossi Bop
International female
Ariana Grande
Billie Eilish
Camila Cabello
Lana Del Rey
Lizzo
International male
Bruce Springsteen
Burna Boy
Tyler, The Creator
Dermot Kennedy
Post Malone
Best album
Stormzy - Heavy is the Head
Michael Kiwanuka - Kiwanuka
Lewis Capaldi - Divinely Uninspired to a Hellish Extent
Dave - Psychodrama
Harry Styles - Fine Line
Rising star
Celeste
Joy Crookes
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Off-roading in the UAE: How to checklist
What can victims do?
Always use only regulated platforms
Stop all transactions and communication on suspicion
Save all evidence (screenshots, chat logs, transaction IDs)
Report to local authorities
Warn others to prevent further harm
Courtesy: Crystal Intelligence
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