Antoine Griezmann admits Barcelona's defeat to Levante wasn't good enough.

He was self-critical after Barcelona were beaten 3-1 by Levante on Saturday in La Liga. The French forward admitted that the team "lacked concentration" after the break.

"We don't have an explanation," Griezmann told Movistar. "We have to see what we did wrong and [get back to] work. I don't know if it was a football problem, our attitude, or everything.

"We have conceded three goals in just 10 minutes and that is because there is a football problem... and a lot of things. But it's something that can happen to you in a football match."

However, Griezmann defended himself, saying it takes time to adapt to a new club, as was the case at Atletico Madrid.

"I am great, it's already happened at Atletico," he added. "You have to come into the team little by little and understand the tactics."