Marion has missed the previous three games because of a bruised left calf suffered during the Mavs' March 6 win over the Houston Rockets. The Mavs had considered Marion to be day to day, but the calf has not been recovering as well as anticipated.
"It isn't getting any better," said Marion, who is not expected to be available for Friday night's home game against the Cleveland Cavaliers. "It's still the same. It's still painful right now."
Marion, a 14-year veteran and one of two 2011 title contributors who remain on the Mavs' roster, averages 11.7 points and a team-high 7.9 rebounds per game. The Mavs have managed to go 7-3 in games Marion has missed this season, although only two of those victories have come against teams with winning records.