The Tweet references a report in the Italian sports paper Gazzetta dello Sport, and reads: "The lawyer of #Mancini in talks with Zenit to free up the coach and allow him to sign a contract with the [Italian FA]. Decisive hours for the national team bench."
Would be surprised if Zenit have much problem with this. Indeed, given that he's presided over the worst league finish for a decade despite heavy spending and his position thus seems to be widely regarded as untenable, you'd have thought they'd jump at any opportunity to terminate his reported 3-year contract without having to pay him off.
His last game in St Petersburg kicks off at 2 pm local time (noon in the UK) on Sunday against SKA Khabarovsk, who are already relegated. He really should sign off with a win against opponents who have 13 points from 29 games and have found the step up after promotion well beyond them. However, whatever happens, Zenit can't now finish in any position other than fifth (meaning they gain entry to the Europa League qualifiers, but disappointingly miss out on the CL for a third successive year).