Atletico Madrid striker Alvaro Morata has said his time at Chelsea was driving him "crazy", with his own teammates doubting his ability.
The Spain international, whose 18-month loan move to Atletico becomes permanent next summer, is enjoying a rich vein of form having scored in six consecutive games.
"I'm happier now," Morata said on COPE radio on Tuesday night. "It wasn't a good time in my football life, I'd stopped enjoying it. At times I didn't believe in myself."
The 27-year-old spent 18 months in the Premier League, in which he struggled for form and fitness, before joining Atletico in January this year.