Nowitzki strained the muscle in his upper leg late in Tuesday's loss to the Portland Trail Blazers, when he scored 12 of his season-high 26 points in the fourth quarter. He does not believe this injury is related to the arthroscopic surgery on his right knee that caused the 11-time All-Star to miss the first 27 games of the season.
"It's just Father Time, bro," Nowitzki told reporters after sitting out Thursday's loss to the Golden State Warriors. "Stuff happens. I never pulled a muscle in my whole career. There's always a first one."
Nowitzki hopes to be able to play in Monday night's road game against the Oklahoma City Thunder.
The 34-year-old Nowitzki is averaging 14.8 points and 5.5 rebounds while shooting 42.5 percent from the floor this season -- all numbers that are by far his lowest since his rookie season in 1998-99. However, he has said several times recently that his knee feels fine and he's been encouraged by his progress over the last few weeks.