Former Chelsea star Olivier Giroud says Thomas Tuchel helped improve the team's confidence when he took over from Frank Lampard last season.
The German arrived at Chelsea midway through the season at a stage where the club were sitting just ninth in the Premier League table.
Lampard was sacked in January and Tuchel helped turn their fortunes around with a top-four finish and by winning the Champions League with a 1-0 victory over Manchester City.
Giroud who left the club in the summer and now plays for AC Milan, has praised the impact Tuchel made.