Tottenham are chasing Stuttgart defender Serdar Tasci.
The Germany international wants to leave Stuttgart this summer and has had a €12 million price-tag slapped on him.
Agent Uli Ferber revealed: ''Lazio, Tottenham and Zenit are realistic possibilities.
"The negotiations could be starting at the beginning of next week.
"One thing is certain, there will be trouble free negotiations with the club.''