"There was a difference in strength and we couldn't stop Diego Costa," Valverde told reporters.
"We tried but they were stronger than us in every single aspect. With Diego Costa, your defenders have to go all out to stop him.
"I'd like Atletico to win La Liga. They deserve it and if they stay first until the end of the season, they will. Seeing as how they're an alternative to the big two, I suppose it's ok."
Atletico are currently one point clear of Barcelona at the top of La Liga.