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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Summer 2016 is set to be a very exciting time for football fans, as this is when the long awaited Euro 2016 tournament kicks off.
Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.