After bringing in David Partridge and Joe Keith yesterday, Leary, a midfielder has joined in an initial month loan deal.
The 23 year old was instructed by his manager Mike Newell to gain some experience after failing to win a place in the Luton Town team for a vast majority of the season and Fitzgerald sees him as the ideal player to help Brentford in their current struggles.
Brentford today also agreed a loan extension for Nathan Abbey, who's contract has been added to by another seven days under the facility to emergency loan a goalkeeper.