Mexican striker Carlos Vela has been allowed to join the Arsenal squad ahead of their UEFA Champions League clash with Manchester United.
Fears over the swine flu outbreak had forced the young striker to spend 24 hours in quarantine following a recent visit from some of his friends back home.
He was advised to stay away from training on Monday and was viewed as a major doubt for the midweek trip to Old Trafford.
However, he has now been given permission to travel with his team-mates for the crucial first leg of the Gunners' European semi-final.
Arsenal manager Arsene Wenger said: "It looked to be a massive problem because we were asked yesterday to keep him at home and not get him to the training ground.
"Now he has the all-clear and today he was free again to attend training."
Wenger added: "It was basically down to the fact he had visitors from Mexico, friends who came to visit him last week."
While Wenger will welcome the news regarding Vela's availability, the Frenchman is still sweating over a number of injury concerns.
Teenage full-back Kieran Gibbs, who has been filling in for the injured Gael Clichy of late, is struggling with an ankle problem, while his likely replacement Mikael Silvestre is nursing a back complaint.
With his defensive options already down to the bare bones, Wenger must now hope that at least one of the crocked duo are able to recover in time to feature against the Red Devils.
On a more positive note, Cesc Fabregas and Johan Djourou came through training on Tuesday unscathed and should be ready for continental action.