Belgium manager Roberto Martinez says Romelu Lukaku became "bored" at Manchester United.

Lukaku scored on his Inter Milan debut last night in victory over Lecce.

“Romelu needed a new challenge. Sometimes you get bored of a club," Martinez told VTM.

“Working with Conte will please him and the project of Inter, which is to aim for the title, is interesting.

"I see Lukaku smiling again and that makes me happy."