"He's gone back for the time being," Chambers told BBC Radio Shropshire.
"Probably on the pitch it didn't quite work out as well as expected. If he's going to come on loan here he needs to be playing."
Grey's departure comes as competition for places up front increases after striker Danny Carey-Bertram scored all four of his goals so far this season against Vauxhall Motors on Tuesday night.
The Bucks play Droylsden on Saturday with only defender Stuart Whitehead a doubt with a hamstring strain.
Hear full-match coverage of Droylsden and Telford on BBC Radio Shropshire DAB and online at bbc.co.uk/shropshire from 1400 GMT.
Source: BBC Sport
Source: BBC Sport