Rangers face one of the favourites to lift the Europa League when they match up with Bayer Leverkusen according to Porto boss Sergio Conceicao.
The Porto boss knows all about both teams having played them both in the Europa League this term.
Rangers face the Bundesliga high-fliers in the Last 16 of the competition with the first leg at Ibrox next week.
Leverkusen dumped Porto out of the Europa League after a 3-1 win in Portugal to go through comfortably 5-2 on aggregate.
Porto have also faced Rangers twice this season with Steven Gerrard 's men winning in Glasgow following a creditable draw away.
But Conceicao believes it will be a tough ask for Rangers to get through because he was hugely impressed with the Germans.
He said: "Let me be clear, Bayer Leverkusen are an extremely strong team and certainly the best we have faced in this competition.
"In my opinion, they are one of the strong favourites to win the Europa League .
"We had to attack them and, unfortunately, that played into their hands. They were extremely quick on the counter-attack. They were too fast and skilful for us.
"They also play in the best league in the world in my view which means they play against strong opposition every week.
"Collectively and individually, Leverkusen are a classy team."
