Lesley, 20, joined the Blues last summer from Rennes and featured on 15 occasions during his debut campaign at Stamford Bridge.

The France Under-21 international was part of the first-team squad for our summer tour of the USA, scoring against Wrexham, before also netting in our pre-season friendly against Inter Milan.

Lesley will now continue his development with the Saints, who secured a return to the Premier League last season under Russell Martin.

We look forward to monitoring and supporting Lesley’s development throughout his loan at St Mary’s.

Good luck, Lesley!