Pogrebnyak enjoyed a promising start to life in England when he scored six in 12 league matches for Fulham last season.
The Londoners could not sort out a permanent deal for him, though, and Reading stepped in to land him on a free transfer.
But it has not gone as well as hoped, with the 29-year-old scoring just two goals in the league all season.
A switch back to former club Zenit has been mooted but Pogrebnyak told Soviet Sport: "What's going on? I'm not ready to answer this question.
"I am yet to discuss the issue with the team's owner Anton Zingarevich, but this is probably necessary. After the defeat to Southampton the situation in the struggle for survival is complicated, but we have good players.
"Am I ready to go back to Russia? No.'