Grabban has left Selhurst Park

The 20-year-old striker has signed a three-and-a-half year contract with the Lions and is set to make his debut against Nottingham Forest on Wednesday.

Millwall manager Kenny Jackett was keen to add a forward to his squad following Ben May's recent move to Scunthorpe.

Grabban made nine appearances during a loan spell at Oldham last season and spent the first part of the current campaign on loan with Motherwell.