An £18m fee had been agreed between the two clubs and Bayern's president Karl-Heinz Rummenigge had even gone as far as wishing Cuisance well at his new club.
In a post on Instagram, Rummenigge wrote: "Thank you for playing at @fcbayern @michaelcuisance. Merci! And all the best for the future."
However, the deal has now collapsed and the Athletic are reporting that it was Leeds who pulled out over concerns after the player took his medical.
The medical is said to have highlighted an injury problem and Cuisance will now fly back to Germany.
There is no word yet on what the injury problem is but Leeds will now have to turn their attentions elsewhere if they want to sign a new playmaker to support the 35-year-old Pablo Hernandez.
In a bid not to tempt fate, Leeds boss Marcelo Bielsa refused to speak about the Cuisance deal earlier in the day, citing the club's move for Dan James in January 2019 which fell apart at the last minute.
"I would prefer to talk about him when he is officially our player," Bielsa said. "I don’t want to repeat the incident with James."
Unfortunately for Bielsa that seems to have happened once again and the Frenchman will not become Leeds' fourth new senior signing of the summer.
Forward Rodrigo and defenders Robin Koch and Diego Llorente have already joined, while the club also made Helder Costa and Illan Meslier's loan moves permanent.
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Leeds may now re-enter talks with Udinese in a bid to sign Rodrigo De Paul.
Like Cuisance, De Paul would provide competition for Hernandez but they have been put off by Udinese's asking price.
Club director Marino has claimed it would take £32m to persuade the Serie A side to sell De Paul, saying: "De Paul to Leeds? They’ve not matched our €35m (£32m) price tag at the moment. Therefore I hope he can stay at the club."