Nigeria, May 7 -- Ola Aina remains a major doubt for Nottingham Forest ahead of their decisive Europa League semi-final second leg against Aston Villa, with injury problems continuing to stretch the squad at a critical stage of the season.

The Nigerian full-back was absent on Monday night as Forest claimed an important 3-1 Premier League victory over Chelsea, a result that moved them six points clear of the relegation zone with only three league matches remaining.

But despite the significance of the win, the growing list of injuries threatening Forest's campaign has become an increasing concern for head coach Vitor Pereira.

Aina, who has been one of Forest's most reliable performers this season due to his versatility and defensive disc...