Frank speaking to BBC Match of the Day: "First and foremost I'm extremely proud of the players and the team. I think they gave everything and showed unbelievable mentality and worked very hard on how to deal with setbacks.
"The way they responded to several setbacks was immense. The first one is the first red, which I think... I've seen it given before but I don't like it. I don't like those types of red cards because I think the game is gone if that's a red card. I don't think it's reckless tackle. I don't think it's exceptional force. We have the referee call and that was a yellow so that's why I don't think that's a red.
"We dealt well with that. The players stayed in the game, defended well, kept going. Then we concede the first goal, and then the second one is a big mistake. Two hands in the back from the striker - as far as I know the laws of football you are not allowed to do that. That's fine to happen on the pitch, the referees are only human but then the VAR bails you out, which they didn't do.
"We stayed in the game, kept going, scored a very good goal for 2-1 and keep fighting. Then I think the second yellow to Cuti [Romero], you have a little feel of the game. Two big boys fighting, Konate is going through him and his foot lands on his head, no yellow. Then there's a little movement from Cuti but I don't think it's a second yellow when you feel the game. We stayed there and did well in terms of dealing with it."
I thought it would mean that it would be a bit more easy but it wasn't! They still had a free-kick and I thought against nine we would keep them away from our goal but it looked like we had nine and they had 11 as they kept attacking.
The second [red card] I didn't see but the first one with Xavi I don't think he had any intention to do it but where he touches him from behind on his calf with his studs.