The rugged Slovakian moved to Anfield from the Russian side in 2008 and has been a key member of the club’s first-team ever since.
However, his future on Merseyside is the subject of much doubt, with Brendan Rodgers thought to be unconvinced by the Eastern European defender’s abilities.
The Northern Irishman froze Skrtel out of his starting XI at the back end of last season, and has recently reluctantly thrust him back into his plans due to Daniel Agger’s injury woes.
The Reds swooped for Mamadou Sakho, Tiago Ilori and Kolo Toure over the summer, leaving them with a wealth of options at the back.
Skrtel is expected to lose his spot in Liverpool’s back three once Agger is fully fit, which has alerted Zenit.
The Russians are willing to pay around £15m for the 28-year-old, who may be tempted to make a return to his former club.
Zenit may make a January move if they advance to the knockout stage of the Champions League, with Skrtel eligible to represent them in Europe due to Liverpool’s lack of continental football this season.
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