The 23-year-old midfielder joined the Jags from Bolton, initially on loan, in 2013 but has battled injury over the last couple of seasons.
Fraser returned to the Jags side as a substitute against Rangers in November, the first of only five appearances this campaign, his last being the 2-0 defeat by Celtic at Parkhead on December 20.
The former Hamilton player will be available for Tuesday night’s Ladbrokes Championship fixture away at Livingston.
Ton manager Jim Duffy told gmfc.net: ‘Gary is a very talented player who has had a few injury problems over the last year and I think that’s impacted on his opportunities at Partick Thistle.
‘When he has played prior to his injury, he’s shown he’s a very gifted footballer.
‘He’s got a good range of passing, can get into the box, score goals, he’s a good acquisition and will complement the players we have.
‘Three or four weeks ago, I wasn’t really looking at that area of the pitch, because I was hoping the likes of perhaps Thommo (Robert Thomson) and Lee Kilday were a bit closer to the first-team.
‘Unfortunately, that’s not been the case so with the games coming thick and fast, we felt it was important to strengthen and he’ll be in the squad tonight.’