The 23-year old striker, dubbed non-League football's hottest property has hit 12 goals so far this term and is being tracked by a host of League clubs, including Wolves.
Molineux assistant boss Ian Evans watched the striker score in midweek as Grays lost to Tamworth, and, although McLean was subdued in the defeat manager Mick McCarthy believes the player has potential and plans to watch the player again.
The promising forward will be available in the January transfer window and, with, Wolves boss Mick McCarthy believed to be keen to add to his striking options, the club are casting their net wide for possible new recruits.
Nottingham Forest are also in the hunt, but the lure of Championship football would be a deciding factor if Mick McCarthy did make a move for the pacey forward.
A tricky striker in the Jemal Johnson mould, McLean is fast and powerful and has been earmarked for greater things.
Grays rejected bids from a number of League clubs in the summer transfer window, with Wrexham making a late bid in August.
The Conference high-fliers are believed to be resigned to losing the forward, who they signed from Aldershot Town in Febuary 2005.
Wolves are one of eight clubs tracking McLean, who started his career at Leyton Orient, and the striker would probably demand a six figure fee if he moved".