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Nicolas Jackson is a signing Chelsea are delighted with since he joined for £32m from Villarreal.

Although he had spells last season where he was criticised for missing chances, he has exceeded internal expectations at Stamford Bridge.

The Blues have always seen the Senegal international as a long-term prospect to develop and 17 goals and six assists in 44 games last season highlighted his faster-than-expected adaptation to the Premier League.

Jackson scoring record in his first campaign at Chelsea was higher than club legend Didier Drogba's.

Like Cole Palmer, Jackson is seen as a proof of concept for Chelsea's transfer strategy, with CIES Football Observatory calculating his transfer value increasing by over £37m over a six-month period in April.

That is why he has been rewarded with a two-year extension to his contract and is now on a nine-year deal in west London.