Martins is keen to return to the Barclays Premier League and be closer to his family, who still live in England.
He has endured a difficult season with Rubin even though he helped them to win the Russian Cup in May, his first trophy success after his move from Wolfsburg in 2009 for £13.5million.
But the 27-year-old was left devastated by the death of his elder brother, Oladipupo, from a suspected heart attack last August.
Martins went on loan to Birmingham during the January 2011 transfer window and the following month scored the winning goal in their shock Carling Cup final win over Arsenal.