The Dallas Mavericks will be among the teams looking for reinforcements when the NBA's one-week transaction window opens on Tuesday. This is after Mavs veteran shooting guard Courtney Lee suffered a calf injury during the shutdown.

Lee required surgery for his injury, per Marc Stein of the New York Times.

Tim MacMahon of ESPN added that Lee suffered the significant calf injury in a “freak accident.”

The Mavs have already clinched a playoff spot for the 2020 postseason. The team is in seventh place in the Western Conference standings.

Courtney Lee appeared in just 24 games for the Mavs before games were suspended in March. He averaged 4.5 points and 1.3 rebounds while shooting 48.8 percent from the field, 44.7 percent from beyond the arc and 85.7 percent from the free-throw line.

The Mavs acquired Lee last season from the New York Knicks in the Kristaps Porzingis trade. He becomes an unrestricted free agent this offseason, so odds are Lee has played his last game for Dallas.

Once the “bubble” games begin in Orlando, Dallas will ultimately go as far as Porzingis and Luka Doncic can take them. Both All-Stars are set to play in their first postseason series in the NBA.

The Mavs haven't won a playoff series since the 2011 championship over the Miami Heat. While the news about Lee is devastating, look for Mark Cuban and Co. to make a solid signing to make up for the loss.