Injured Hawks center Al Horford is on the active list for the Hawks tonight and is a game-time decision to see his first action since suffering a torn Pectoral muscle way back on January 11.

Al Horford (pectoral) is active for #Hawks. Still not certain he will be available. Game-time decision. #Celtics

— Michael Cunningham (@ajchawks) May 6, 2012

The Hawks have their backs against the wall as they can ill-afford to return home for Game 5 down 3-1 in the series. Horford has been practicing with the team for sometime now and would bring a psychological boost to the team if nothing else.

Josh Smith is also expected to return to the lineup after sitting out Game 3 with a knee injury.

For more on the Hawks-Celtics playoff series check out Peachtree Hoops and CelticsBlog. For more news and notes regarding the NBA Playoffs head over to SB Nation's NBA Basketball page.