This is the original source I think. LVZ is Leipzigvolkzeitung so pretty sure they're fairly credible in this matter.
Ideal situation would be Keita plays the Leipzig vs Schalke match and is subbed at half-time to say goodbye to the fuckers and then gets on as a second half sub for our match against City
Now this is interesting. The bit in inverted commas translates as: "Looks like Naby Keita will be turning out for Leipzig for the last time."