The teenager is enjoying a superb spell at Dutch Eredivisie side Willem II, scoring 11 goals in as many games since arriving in January.
Mourinho or Conte? Inter Milan considering options
The 19-year-old did not get many first-team chances since signing from Stockholm club AIK.
The Mirror reports that Chelsea sent out a scout to watch Isak in action against Ajax this weekend.
Real Madrid have finally set a price for Gareth Bale
Chelsea have suffered in the recent past with striking option after Alvaro Morata, Gonzalo Higuain and Olivier Giroud were unable to replicate Diego Costa's success at the front.
Solskjaer opens up about Pogba's future at Manchester United
However, they may face an uphill task if they plan to sign the Swedish youngster since Spanish giants Real Madrid are also monitoring his progress.
COMMENTS
Comments are moderated and generally will be posted if they are on-topic and not abusive.
For more information, please see our Comments FAQ