Tony Adams has warned Arsenal's title hopes could hinge on keeping six key players fit until the end of the season.
Mikel Arteta’s side are currently eight points clear at the top of the Premier League with 10 matches remaining of the season, although reigning champions Manchester City have a game in hand.
Adams claimed the Gunners recent defeat to Sporting Lisbon in the Europa League last-16 had shown the club's back up players were 'bang average'.
The former Arsenal captain said the result showed the club need to keep their key stars fit for the run-in, before investing heavily in the summer to strengthen for their expected return to the Champions League.