On Wednesday, Klay Thompson, 30, suffered a lower right leg injury, for which he has been undergoing tests to determine the severity of that injury, according to his team Golden State Warriors.

Chris Haynes, Yahoo Sports’ Senior NBA Insider, reported that Thompson may have an Achilles injury and will need an MRI today.

Bill Reiter, a writer and sports personality for CBS Sports, said the expectation is that the injury is believed to be serious.

The Athletic’s Shams Charania said Thompson was unable to put any weight on the leg after the injury.

Thompson, who missed the entire 2019-20 season after having an ACL (anterior cruciate ligament) tear in his left knee, was all set to return and play in his first NBA game in December. Now, of course, that is up in the air, according to CBS Sports.

Before the ACL tear, Thompson was one of the NBA’s most reliably durable players. Before the 2019-20 season, he never missed more than nine games in a season.

With Thompson unlikely to play, the Warriors will bring in Stephen Curry, who is expected to return at full strength when the season begins, Draymond Green, and Andrew Wiggins.

However, the Warriors had hoped to launch themselves back into championship contention behind the trio of Thompson, Curry, and Green.

If Thompson is not fit enough to contribute in the playoffs, the Warriors simply is not a championship contender, according to CBS Sports. The team will have to hope that his injury is not severe enough to compromise his postseason.