Leicester City have offered Charlton's Bulgarian international defender Radostin Kishishev a one-year deal.
Kishishev spent three months on loan at Leeds last season
Kishishev, who has been at Charlton for seven years, will be out of contract on 1 July and if decides to sign for the Foxes would join on a free transfer.
"He is with the Bulgaria team at the
moment and is mulling over Leicester's offer," Kishishev's agent Tommy Langley told BBC Sport.
Last season Kishishev, 32, spent three months on loan at Leeds United.
According to Langley another unnamed club are interested in Kishishev.
The Bulgarian defender, who has been capped 59 times by his country, made 18 appearances for Alan Pardew's side last season.
His last game for the Addicks was in the 1-0 win over Portsmouth on 20 January.