Chelsea have had an offer of around £3million for Celtic goalkeeper Craig Gordon rejected.
The Premier League leaders have targeted the 34-year-old as Asmir Begovic wants to move to Bournemouth, as revealed by Sportsmail last week.
Eddie Howe is believed to have put a £10m bid in for the former Stoke City goalkeeper but Chelsea need experienced cover for Thibaut Courtois before they agree to a sale.
Eduardo Carvalho, who moved to Stamford Bridge in the summer and has yet to play for the Blues, is Antonio Conte's only other senior goalkeeper and is not a viable option for the second-choice slot.