The Republic of Ireland striker has been left out of the St Andrews squad in recent games, in the exception of making a substitution in the 1-0 win at Bolton Wanderers.
Clint Morrison celebrates his goal against rivals Aston Villa last season.
However it has already been suggested that Carl Cort was coming to the Lane on loan from Newcastle United but the Magpies striker wasn't interested.
Meanwhile Morrion's team mate Ian Bennett is also a name that could be on the move to United when Paul Gerrard's loan spell ends at the end of Christmas.