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Simpson, 19, joined the Lions on transfer deadline day in the summer and has gone on make 20 appearances for the south-east London side in all competitions so far this season, scoring three goals along the way.

The London-born forward is now set to return to the Premier League leaders, for whom he has yet to make a first team appearance, in May.

Millwall manager Kenny Jackett (pictured) said: "I'm very pleased that he will be staying until the end of the season.

"Jay is a very promising young player who I am sure will improve further during the second half of the campaign."