André Villas-Boas has said he will resign as Zenit St Petersburg’s manager at the end of the season after he was blocked from doing so in the summer.

The former Chelsea and Tottenham manager won the Russian Premier League with Zenit last season in his first full campaign, but his time in St Petersburg has turned sour and he is currently serving a six-game ban for assaulting a match official.

The 37 year-old said on Zenit’s website: “At the end of the last season the club offered me the chance to extend my contract, but I refused this offer and at the end of this season I will leave my post.

“We did not undertake the work during the transfer window that we had expected and the squad is limited. It has not been strengthened with the exception of those players who came at the start of the transfer window. The limit on foreign players has changed.

“Even despite this we will carry on working and we need to get points to catch those who are in front of us, while we will also try to be successful in the Champions League.”

Zenit lie third in the table after seven games of the season, six points behind CSKA.