Aston Villa captain John McGinn faced up to a chaotic Europa Conference League semi-final first-leg loss to Olympiakos, and said: "Everything that could have gone wrong, did."

Ayoub El Kaabi scored a hat-trick for the visitors, netting twice early on.

Ollie Watkins reduced the deficit for Unai Emery's side and Moussa Diaby equalised moments after the interval.

Olympiakos roared back in front with an El Kaabi penalty and a deflected strike from Santiago Hezze.

Douglas Luiz missed a late penalty, meaning Villa must overturn a two-goal deficit in the second leg in Piraeus on 9 May to reach their first European final since 1982.

"There were mistakes all round tonight and we'll take responsibility," McGinn told TNT Sports.

"We have a mountain to climb but we know we're capable. The manager was still positive in there. There's still a long way to go."

El Kaabi began the goal flurry with a clinical finish. It was initially disallowed for an offside, but that was overturned after a check by the video assistant referee (VAR).

The Morocco striker added a classy second when he latched on to Daniel Podence's clever pass over the top and slipped the ball under Robin Olsen.

Watkins pulled a goal back for Villa in added time in the first half with an angled finish from just outside the six-yard box.

Diaby then levelled as Konstantinos Tzolakis was beaten at his near post.

Villa seemed to have the momentum at that point but were sucker-punched by their visitors.

Douglas Luiz handled a Panagiotis Retsos header and El Kaabi coolly sent Olsen the wrong way from the resulting spot-kick to take his tally to eight goals in the competition.

There was more than an element of fortune to Olympiakos' fourth as Hezze's speculative effort flicked off the back of Ezri Konsa to wrong-foot Olsen.

Douglas Luiz had a late opportunity to atone for his error after David Carmo felled Jhon Duran but, to the incredulity of the home fans, he failed to hit the target.