The Well boss has lauded his shot-stopper's ability and believes that the Ireland international will not be at Fir Park for much longer as his contract nears expiry
The Republic of Ireland international joined the Steelmen in 2010 from Charlton Athletic and has been a regular fixture in the Scottish Premier League team.
However, McCall has resigned himself to losing the 25-year-old goalkeeper, admitting his surprise that the club had not received any offers for the player over the past two seasons.
"I have been surprised that we have not had offers for him over the 18 months," McCall told the BBC. "I would be absolutely delighted if we managed to keep Darren but I think it is a slim possibility."
He continued: "Darren has been outstanding for us and if I was managing in the Championship now I would go for him straight away, and that's not me trying to off-load him.
"He is not only an outstanding goalkeeper, he is a really good guy, he is composed, he gets about his job, never lets us down - you would think I am his agent but I am not.
"I would be extremely surprised if he didn't have very good options," concluded the Motherwell boss.