The 20-year-old signed for the Gulls in 2010 full of promise, but has flattered to deceive and has been made available for transfer.
"We have had no interest in Lloyd, which doesn't surprise me, and I hope Lloyd and his agent are reading this," Ling told the club's official website.
"He needs to pull his finger out and get on with his career. I've not had one phone call about Lloyd, which should tell him what he needs to do.
"People have been talking about massive potential with Lloyd for five years. He was the youngest player to play for the Swindon first-team and yet we're five years down the line waiting for that potential to be fulfilled.
"If he comes back here for pre-season, I would never ostracise anyone, but he needs to show me something. The problem is with Lloyd and not the people working with him."
