The pair have built up a good partnership in the centre of midfield, with Racon racking up 20 appearances so far this season and Semedo making 17 appearances.
The pair will be free agents in the summer if no new terms are agreed, but Addicks boss Phil Parkinson told the South London Press: "I've spoken to the chairman and we're going to sit down with those players and open talks."
Source: PA
Source: PA