"I want to keep my standards. I don't want to be mugging anyone in the Premiership," he told the Portsmouth News.
However, Pompey assistant manager Jim Smith said he would be surprised if Merson called it a day at the end of the season: "There is a long way to go and I would be surprised if he finished," said Smith.
"Paul's a proud man and would love to finish on a high. I know what he's saying - he's a very honest player. But we wouldn't want him to go at the end of the season. We want him to stay."