Chelsea are closing in on a deal for Crystal Palace winger Michael Olise after agreeing to trigger his 35 million ($45m) release clause, sources have told ESPN.

The 21-year-old is keen on a move to Stamford Bridge and will now finalise personal terms ahead of a medical, although he is sidelined for several weeks with a hamstring injury.

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Olise has attracted interest from a number of clubs including Manchester City but Chelsea have moved quickly in recent days to try to secure his signature.

Chelsea have spent more than 275m so far this summer -- including breaking the British transfer record to sign Moisés Caicedo from Brighton in a deal worth up to 115m -- but are continuing their policy of signing young talent on long-term contracts.

Olise joined Palace from Reading in 2021. He scored two goals and registered 11 Premier League assists in a 2022-23 campaign which saw him voted the club's Players' Player of the Year.

The France Under-21 international would be Chelsea's eighth major summer signing if a final agreement is reached and a ninth could follow quickly as talks progress with Southampton over a move for Romeo Lavia.

As was the case with Caicedo, Chelsea are believed to be edging out Liverpool in the race to sign Lavia, who has stated a preference to join the London club.

The two clubs have yet to finalise a fee but sources suggest a deal is likely to be worth in excess of 50m with add-ons potentially taking the overall value closer to 60m.