Chelsea will be keeping a close eye on their loanees throughout this season as they look for them to be nurtured enough to feature in the first team squad from as soon as next year.
Enzo Maresca has benefitted this season from having Andrey Santos in his ranks, after the impressive youngster developed his game at Strasbourg over the prior 18 months.
The Blues will be hoping for similar results from Mamadou Sarr, Mike Penders and Kendry Paez, who are all currently featuring for the Ligue 1 side.
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Elsewhere in Europe, one of the best-performing Chelsea loanees has been Aaron Anselmino, who has been a regular starter at Borussia Dortmund.
Aaron Anselmino of Borussia Dortmund controls the ball
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Chelsea should be fuming at Borussia Dortmund as Aaron Anselmino injured again
The Bundesliga side want to sign Anselmino permanently, but may be in danger instead of tarnishing their relationship with the Blues for good.
The Argentine had recently suffered an injury issue, although was thrown back into the starting side straight away for four of the last five games.
This culminated with the Champions League clash against Bodo/Glimt, where he was forced off after 77 minutes with a muscle injury.
It is clear to see why they rely so much on the Chelsea loanee. Dortmund are unbeaten in the four games he started, while losing the other against Bayer Leverkusen.
There will be hope that the issue is not serious, however with the ongoing fitness problems at Stamford Bridge they will be hoping that they can avoid adding another injury-prone player to the first team squad.
Chelsea FC v Paris Saint-Germain: Final - FIFA Club World Cup 2025
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Chelsea fans already worried about Anselmino
Anselmino has already made his Chelsea debut at the Club World Cup, but there is already cause for concern about his fitness record.
Blues fans have voiced their worry about Anselmino’s injury record at such an early stage of his career.
Centre-back is certainly a position Chelsea could do with strengthening after Maresca has struggled to settle on a partnership at the back this season.
The likes of Tosin Adarabioyo and Benoit Badiashile have not staked their claim to be regulars in the side since the injury to Levi Colwill.
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