Pittman's injury occurred late in Friday's practice. He watched Saturday's practice from the sideline with his arm in a sling. Texas head athletic trainer Kenny Boyd said it is not yet known how long Pittman will be out.
"Billy will be out indefinitely," said Boyd in a release from UT Athletics. "We will continue to evaluate him and monitor his progress in hopes of getting him back in time for the season opener."
In the release, Pittman said he hopes to be ready for the opener against Arkansas State on September 1st.
"I felt like I was having a really good camp and in the best shape of my career so I'm pretty disappointed about getting hurt," said Pittman. "I have faith in our doctors, trainers and strength staff that they will get me back as soon as possible, hopefully for the first game. I'm going to listen to them and be patient because I know how important it is for me to get this shoulder back to 100 percent and strong enough to handle a long season."
Pittman has caught 69 passes for 1,206 yards and nine TDs over the last two seasons. The Longhorns practiced inside the bubble at Frank Denius Fields on Saturday after the morning's open scrimmage was canceled because of the threat of heavy rains, according to UT Athletics.