The 24-year-old defender is lonely and bored and would like to return to St Petersburg, according to his close friend, Zenit goalkeeper Kamil Contofalsky.
Contofalsky told Russia's 90 Minutes Magazine: "I talk a lot to Martin on the phone and he said he would like to return to Zenit because it's very boring for him in England.
"He feels lonely there, doesn't have any friends. And also the local paparazzi follow him all the time.
"There's no such camera madness in Russia and Martin confessed to me that life in St Petersburg was better for him.
"But that doesn't mean he regrets his move to Liverpool. He made it into the main squad quickly and played top class football which is much better than in the Russian premiership."