Northern Ireland youth international Croskery is a free agent after leaving United earlier this summer after two years at Old Trafford.
Croskery made the move to United in the summer of 2013 after impressing at United's Centre of Excellence in Lisburn, and he quickly made his mark with the Red Devils.
The 18-year-old made 11 starts in his first season in United's Under-18s, scoring five goals, but he saw his second season interrupted by injuries.
Croskery still managed to score four goals in 16 starts last season, but was released in the summer at the end of his contract.
Several Premier League sides are thought to be keeping tabs on the teenager, while seven Championship sides have already expressed an interest in signing the Northern Ireland forward.
Croskery is now weighing up his options as he decides where next to continue his career in England.