Everyone I talked to on Sunday night said this Clasico was one of the best we've ever seen.
Guillem answers your questions...
Got a question for Guillem? Then send it in using the feedback form below, and then look out for his answer next week...
FOUR SIGHTSHi Guillem, After Athletic Bilbao got back to winning ways on Saturday, do you expect them to now hold on to fourth spot and secure Champions League football for next season? Thanks, Michael
GUILLEM SAYS: It has been an interesting process at Athletic Bilbao and Ernesto Valverde had two things to do. One was to cheer up the team and the club after a difficult year with Marcelo Bielsa and he did that very early. He also experimented at the back and finally he has got a settled XI with Ander Herrera, who suffered after the Manchester United deal fell through, back to his best. Bilbao should finish fourth.
COSTA ON THE MOVE?Hola Guillem! Love the column! Diego Costa seems back to his goalscoring best again after his mini-drought earlier this year - has he made any adjustments to get back among the goals? And what do you make of the rumours linking him to Chelsea? Thanks, Sam
GUILLEM SAYS: Atletico Madrid have to sell and Costa's buyout clause is 36million euros. Chelsea are favourites but they are not the only team that want him.
CHAMPIONS LEAGUE THOUGHTSHello Guillem. What did you make of the Champions League draw last week? Do you think Atletico can surprise Barca? And are Real happy with Borussia Dortmund? Can they avenge last season's semi-final defeat? James
GUILLEM SAYS: I think Atletico can surprise Barcelona, but I see Chelsea, Real Madrid and Bayern Munich going through.
