The ex-England international and Tottenham, Arsenal and Portsmouth defender terminated his five-year contract with the League Two club on Wednesday and a source close to him admits that his time in the game could be up.
"What happened at Morecombe was a huge reality check for Sol," the source said.
"A lot of people were telling him not to go to County in the first place, especially when he had offers from Villa, Newcastle and Hull, or could have stayed at Portsmouth.
"It was just they they were only offering him a deal for one or two years and it was very much his decision, something between him and Sven.
"He's felt disappointed about a few things, not least that he was under the impression the club would be signing more high-profile personnel, and not only him and Kasper Schmeichel.
"Sol has also realised that there could be investigations going on into the whole club.
"At the same time, although he was committed to the idea and looking to buy somewhere in Nottingham, he did feel in an awkward situation.
"Eriksson was one of the reasons he joined the club but he had to work with Ian McParland, and the atmosphere from Ian towards him was ambivalent at best. In the end he just realised he'd made a mistake."
A likely ban from Fifa that will keep Campbell out until January could also persuade him to hang up the boots.