Lionel Messi 'playing out of his skin' for Barcelona, says Sergi Roberto

Messi in inspired form as 10-man Barca beat Celta Vigo away

Barcelona’s Lionel Messi celebrates after his shot was deflected in for Barca's second goal against Celta Vigo. Reuters

Barcelona's Antoine Griezmann jumps with teammates to try to block a Celta Vigo free kick. EPA

Barcelona's Gerard Pique eacts after being shown a yellow card. EPA

Lionel Messi and Ansu Fati. EPA

Celta Vigo’s Lucas Olaza scores an own goal and Barcelona’s second. Reuters

Celta Vigo’s Iago Aspas in action with Barcelona’s Francisco Trincao. Reuters

Barcelona forward Lionel Messi vies with Celta Vigo's Jeison Murillo. AFP

Celta Vigo's Spanish forward Iago Aspas. AFP

Ansu Fati, left, celebrates after giving Barcelona the lead at Balaidos Stadium in Vigo. EPA

Celta Vigo's Ghanaian defender Joseph Aidoo heads a ball. AFP

Barcelona's Spanish defender Sergi Roberto celebrates after scoring his side's third goal. AFP

Barcelona's defender Sergi Roberto celebrates. EPA

Barcelona’s Lionel Messi in action with Celta Vigo’s Jose Manuel Fontan. Reuters

Lionel Messi celebrates a goal. EPA

Barcelona’s Lionel Messi. Reuters

Barcelona defender Sergi Roberto says Lionel Messi is "playing out of his skin" for the team after watching the wantaway Argentine put on a masterclass in the 3-0 win at Celta Vigo.

Messi has raced out of the blocks to start the season, as if on a one-man mission to prove that there is no lingering animosity over his doomed bid to force a move away from Camp Nou earlier this summer.

After Ansu Fati had opened the scoring, Messi helped double Barca's lead early in the second half as he powered down Barca's right deep into Celta territory before unleashing a shot that deflected in via Lucas Olaza.

Messi later had a strike ruled out for offside and then created Barca's third goal in added time, slaloming through Celta's defence again before and firing a shot that Celta  goalkeeper Ivan Villar could only parry into the path of Roberto who duly tucked home the rebound.

"Leo is so fired up right now," Roberto said. "He ran so much today and played out of his skin for the team."

Messi has sought to draw a line under his efforts to leave the club over the summer as well as his vociferous criticism of president Josep Maria Bartomeu, saying in a recent interview that the time had come for everyone at the club to pull together.

While most of Messi's threat came in the opposition half there was a notable contribution to shore up Barca's defence, running himself into the ground to help them cope with having defender Clement Lenglet sent off in the first half.

"We're so happy that Leo is still with us and the fact he is so motivated is a huge boost for us," added Roberto.

Coach Ronald Koeman also pointed to Messi's willingness to sacrifice himself, adding: "Messi worked very hard off the ball tonight which was very important for us tonight."