Villa booked their place in the Europa Conference League semi-finals with a thrilling penalty shoot-out victory over Ligue 1 side Lille.
Olympiacos also need penalties to see off Fenerbahce in their quarter-final tie and will undoubtedly be tricky opponents for Villa.
However, the Premier League side should possess too much quality for the Greek outfit and are fancied to progress to the final.
Fiorentina are their most likely opponents, with the Serie A side expected to defeat Club Brugge in the other semi-final.
In the Champions League, Real Madrid are now the favourites to win the competition after overcoming Manchester City in the quarter-finals.
The 14-time European champions are tough to beat in Europe and look a good bet to lift the trophy at Wembley Stadium.
We picked out Bayer Leverkusen as the value bet to win the Europa league before the quarter-finals and they are now the favourites after Liverpool crashed out.
While Roma have the potential to be troublesome semi-final opponents, Leverkusen should emerge victorious from the tie.
