Celtic midfielder Jiri Jarosik is being offered a £1 million-a-year to return to Russian football in January.
Jarosik said: "Celtic have done well and I'm playing regularly - but in football everything can change in the blink of an eye.
"In the summer there was an offer from a Russian club but a move to Dynamo Kiev was more likely although it fell through.
"And besides, looking at how Kiev have performed in the Champions League maybe it was for the best."