Granger hasn't looked like he is able to help anybody nowadays. The Clippers have good depth at SF with Jared Dudley, Matt Barnes, Hedo Turkoglu and Reggie Bullock. I don't expect Granger will be able to beat out any of those guys for minutes.
I wonder if his future is more at the PF spot than at SF. Injuries seem to have taken some of his quickness, agility and explosiveness away. He might fare better offensively against slower less capable (on the perimeter) defenders.
Granger had some good minutes at PF a few years ago for Indiana. His shooting and scoring was a real matchup problem and he could defend a decent number of opponents (enough to find him minutes as a backup PF). Not the matchup problem he was then but his shooting should still provide a benefit for his team.
Since the Clippers big man depth is so bad, Granger @ PF might be an option worth pursuing.