Mendes scored one of the goals that saw the Portuguese side progress to the next round of the Europa League, where they will meet Atletico Madrid.
“We needed this win,” he 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.”