Manchester United striker Wayne Rooney is expected to play for England in the Euro 2012 qualifying match at Wembley on 12 October.
Online bookmakers are offering free bets to new customers ahead of the Group G game against unbeaten Montenegro.
Rooney aggravated an ankle injury against Bolton which forced him out of United’s Champions League game in Valencia and Saturday’s Premier league clash against Sunderland.
His absence caused concerns he could miss England’s next game as United’s boss believes Rooney has been nursing the problem for some time, but has kept quiet in his eagerness to play.
He said: “He’s been playing a few weeks with his niggling ankle injury and he’s kept it to himself so it comes to a point where it suffers.”
Sir Alex has insisted that Rooney is properly recovered from the knock he has kept under wraps, so as not to risk a more serious problem down the line.
Fergie added: “He always thinks he’s fit and that’s the problem with the lad, he’s always too willing to play even with injuries, which is a great trait to have actually for any footballer.”
Fabio Capello is due to announce his England squad on Monday and after allowing Rooney to train, Ferguson believes the striker will be fit in time to play, saying: “I think in a week’s time Wayne will be 100 per cent fit.”
Capello has been making changes to England style of play as he looks build a new platform after the World Cup disappointment last summer.
Rooney’s new free role has brought immediate success as England have returned to the assured force they looked prior to World Cup 2010.
Online bookmaker Totesport are offering odds of 9/1 for England to win Euro 2012.