During his time in charge of the Blues, Jose Mourinho invited the pop star to work with the club as he recovered from knee reconstruction surgery
One Direction star Niall Horan has revealed how he spent four months training with Chelsea.
The Irish singer was invited to spend time at the Premier League club by then-manager Jose Mourinho.
Horan explained he trained at Chelsea's Cobham training ground as part of his recovery from a knee injury, in order to prepare for a One Direction world tour.
"Jose - great man," Horan told talkSPORT.