Real Madrid have vehemently denied reports they have made an approach to sign Juventus midfielder Paul Pogba.
Norwich City have confirmed six players, including Javier Garrido, Carlos Cuellar and Mark Bunn, are to depart the club.
Seaborne has won three and drawn one of the four matches he has played in since making the temporary move to The Valley.
The 25-year-old was forced to sit out the final match of his original loan spell, last Saturday's 2-2 draw against Brighton.
But Seaborne will get the chance to extend his unbeaten run in the Charlton team after a fresh deal was struck.