As luck would have it, they are not going to have to try.
Injury update: Tony Parker will play tonight in Game 4.
— San Antonio Spurs (@spurs) June 13, 2013
It would have been a surprise if the team had opted to sit him. With the chance to close out the NBA Finals in San Antonio there is no way that the team is not going to want its superstars on the court if they can walk. According to the MRI there were no tears or defects found, and the injury was deemed a minor strain.
What they will probably do is make sure that he gets to the court early--not just on time and unlike Game Three when he was late--for as much treatment as possible. There is only so much that they will be able to do that can actually help, but if it can you better believe the Spurs are going to do it.