The Russian side added the Witsel to the signing of Hulk on an extraordinary day in the transfer market.
Zenit reportedly met the €40million release clause in Witsel’s contract with Portuguese side Benfica.
The Russian transfer window remains open until later in September.
Witsel has previously been strongly linked with a move to Premier League giants Manchester United.
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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.