The Premier League side were in the driving seat in Portugal thanks to their 2-1 win in the first leg, until Miguel Veloso broke the deadlock on the night in the 64th minute.

Further goals from Mendes and Matias Fernandez sealed progress for the Portuguese side to book a tie with Atletico Madrid.

"We needed this win," former Portsmouth and Rangers midfielder Mendes told Five.

"We wanted to progress in this competition. I think we performed really well in the first leg, we were unlucky with the result.

"Today we did what the gaffer asked - patience. We knew we couldn't concede or it would be very tough for us.

"We've been a little unlucky (recently). It's exactly the same in the league here - we've been struggling for results. We needed this performance today."