Vela, making his first start for the club, only lasted 6 minutes before he had to come off to be replaced by Keith Andrews.
Owen Coyle has issued a statement on the injury and said "Josh landed awkwardly and that is how the damage has been done,"
"We feel for him because he had a period of injury last season, but he bounced back from that and appeared in the Premier League where he showed his quality.
"He will bounce back from this too and we will give him every ounce of help to make sure that he returns and becomes the top player that we all believe he can be."
Bolton Nuts would like to wish Josh a full and speedy recovery.