"I am still thinking about my future," said Seol, who made 31 appearances last season and hopes to recover from ankle surgery in time for July's Asian Cup.
"If I am not in the team next season I will definitely have to find whether another team wants a player like me."
Seol scored four league goals in 27 appearances following his £1.5m move from Wolves 12 months ago.
"I have spoken with the manager and he knows I am thinking that and he said he doesn't like players who are happy to be out of the team," he added.
"I don't know what will happen, but as a professional player I will keep doing my best and we will see what happens."
