Fabricio Coloccini has re-affirmed his commitment to Newcastle amid fresh speculation that he wants to leave.
Paris St Germain forward Ezequiel Lavezzi has not ruled out a move away from the big-spending club.
Hubocan is thought to have caught the eye of the Premier League clubs along with Serie A sides Inter Milan and Napoli.
The 27-year-old has impressed for Zenit in this season's Europa League and he helped the Russian outfit overcome Liverpool last month.
Hubocan's agent, Michal Holescak, claims Tottenham and Newcastle have expressed an interest in the centre-back, but that the player is happy at Zenit.
"Newcastle and Tottenham are interested in him, but we had contacts with Inter Milan and Napoli too," Holescak told tuttomercatoweb.com.
"Tomas is a top defender, a player for big European teams. However he is happy in (Luciano) Spalletti's team: he's focused on the Russian Premier League and on the Europe League."