Tosun joined Crystal Palace on-loan in January but suffered an anterior cruciate ligament injury that needed surgery.
“I only had a chance to work with Ancelotti for one month," Tosun told Futbol Arena.
“However, my first impressions were very good about him. He brought calmness to the team."
“However, I think we can FA Cup or League Cup. Because the club is running in a very professional way, and we have quality players.
“This is a very big club, and I realised that when I saw the fans. I think we have the best fans in England. We are playing in a historic stadium in Goodison Park."