The former RB Leipzig man had hit the ground running under Mauricio Pochettino after touching down in West London, scoring in his first two games for the club against Wrexham and Brighton & Hove Albion.
Nkunku also made the net ripple in a 2-0 win over Fulham on July 30 as Chelsea clinched the Premier League Summer Series, but his outing against Borussia Dortmund on Wednesday came to an end with just a quarter of the game gone.
The 25-year-old hobbled off with a knee injury at Soldier Field after a collision with Mats Hummels, as Chelsea rescued a 1-1 draw against their German counterparts to end their pre-season campaign unbeaten.
Concern was immediately raised about the severity of Nkunku's issue, but according to the Evening Standard, the Frenchman will not be spending months on the sidelines as initially feared.
However, Nkunku could still be out for a number of weeks, and as a result he is not expected to be ready in time for Chelsea's opening 2023-24 Premier League clash against Liverpool on August 13.
Nkunku underwent scans immediately after touching back down in London on Thursday, and the results are said to have been reassuring for the former Paris Saint-Germain attacker.
Chelsea played out their stalemate with Dortmund at Chicago's Soldier Field after the ground had hosted an Ed Sheeran concert, leading to complaints from players about the poor surface conditions.
Nevertheless, Pochettino refused to blame the pitch for Nkunku's injury, instead attributing the Frenchman's problem to «bad luck», telling the press: «I didn't see
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