The Blues have been active during the summer transfer window , and they have signed another promising young player.

Ugochukwu made 37 appearances for Rennes in the most recent campaign. He was one of the best performers for them.

The 19-year-old is a defensive midfielder by trade, and it remains to be seen whether he will be with the squad next term.

A statement on the club's official website read: "We're delighted Lesley is joining Chelsea ."

"He is an impressive young player who has already made his mark in Ligue 1.

"He has a huge amount of potential and we know he is going to continue to develop and improve."

Ugochukwu has travelled to the United States for Chelsea 's final pre-season game against Borussia Dortmund in Chicago.

Blues manager Mauricio Pochettino is likely to hand him minutes in order to judge whether he can play for the first-team.

Based on this, the final decision could be made. The Blues could loan him out to Strasbourg if Pochettino does not fancy him.

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