The Houston Texans announced that rookie quarterback Deshaun Watson tore his ACL during practice on Thursday and will undergo a season-ending surgery.

Watson, 22, fell during non-contact practice on the field, ESPN's Adam Schefter reported. An MRI revealed that it will take about 8-9 months for rehabilitation and that he should be ready for the start of the 2018 season. It isn’t clear now which knee was injured.

He was not able to finish practice and was replaced by quarterback Tom Savage. The Texans will sign Matt McGloin as a backup quarterback, the Houston Chronicle reported. 

As a freshman at Clemson University in 2017, Watson played with a torn ACL in his left knee, according to then-coach Dabo Swinney.

Watson’s injury comes just after Texans defensive end J.J. Watt had undergone season-ending surgery this month to repair the fractured tibial plateau in his left leg.

The Texans have a (3-4) record in the AFC South and have seen shades of brilliance from the rookie quarterback. He passed for 402 yards and four touchdowns in the Texans' 41-38 loss to the Seattle Seahawks on Sunday at the CenturyLink Field in Seattle, Washington.

"It's just unfortunate. It's terrible news," Seattle Seahawks cornerback Richard Sherman said of the news. "Feel terrible for him and his family. He had such a bright future. He still has a bright future but his rookie year is cut short. He probably had one of the best rookie months that anybody's had in a long time, so I'm sure he'll still be in the running for rookie of the year, but it's just not anything you want to hear."