Daniel Gafford’s first practice with the Dallas Mavericks this fall didn’t go well.

Gafford sustained a sprained ankle in the Mavericks’ first practice of training camp in Vancouver on Tuesday, head coach Jason Kidd confirmed. Gafford will now be sidelined for two to three weeks recovering, which is putting his availability for their season-opener against the San Antonio Spurs on Oct. 22 in doubt.

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Gafford, who turned 27 on Wednesday, will now miss the rest of training camp and the preseason.

Gafford had a career season with the Mavericks last year. He averaged 12.3 points and 6.8 rebounds in 21.5 minutes per game, and shot just better than 70.2% from the field. He inked a with the team this past offseason, too. Gafford, who split time in the starting role alongside Dereck Lively, missed time near the end of the season due to an MCL sprain.

The Mavericks are coming off a wild season in which they traded away star Luka Dončić surprisingly for Anthony Davis. The team spiraled after that due to several major injuries, including to star Kyrie Irving — who is still recovering from a torn ACL. The Mavericks, one year removed from a trip to the NBA Finals, went just 39-43 and missed the playoffs completely. Dallas, though, won the NBA Draft lottery and ended up selecting Duke star Cooper Flagg with the No. 1 overall pick.

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Mavericks forward P.J. Washington also missed practice on Wednesday due to a head injury. He was seen colliding with Jaden Hardy during one-on-one drills on Tuesday, , but Kidd is hopeful that he can return later this week. Washington, who averaged 14.7 points and 7.8 rebounds last season, signed a last month.