Dons release Morgan
The 21-year-old's contract expires in the summer and the club will not be offering him a new deal.
Morgan was highly regarded at Wimbledon, attracting the interest of Tottenham in the past, but injuries have held the midfielder back from showing his true worth.
Dons boss Stuart Murdoch confirmed Morgan was free to find a new club.
"Lionel Morgan is out of contract. I've spoken to him and we won't be renewing it," said Murdoch.
"At this stage he's a free agent and he's getting himself fit for pre-season to find another club.
"We're still offering him our facilities for treatment and to get fit."