The midfielder's trained after he missed their last two games with a thigh injury.
The tie's level at nil-nil.
David Silva will miss the match with a hamstring problem – and Samir Nasri's ineligible.
Liverpool midfielder Emre Can has surprisingly returned to training following injury ahead of Thursday's Europa League semi-final second leg with Villarreal.
He was expected to miss the rest of the Premier League season after straining ankle ligaments last month.
It's not clear if Can will be ready for Thursday's match at Anfield – where Liverpool will try to overturn a 1-nil deficit against the Spanish club.
Tonight Bayern Munich host Atletico Madrid trailing 1-0 from the first leg.
Kick off is at 7.45
