Jackson (hamstring) practiced Wednesday, but he remains questionable for Friday's preseason finale versus Miami, Michael Wallace of the Grizzlies' official site reports.
Jackson continues to deal with a low-grade hamstring strain, and while he has yet to be fully cleared, the fact he has a chance to suit up Friday bodes well for his future availability. A decision on Jackson's status for Friday's game "will be made after Thursday's workout," per coach Taylor Jenkins.