Freshman receiver Devan Stubblefield is undergoing medical tests to determine the severity of a knee injury he suffered during Monday’s practice. 

Stubblefield, a 2014 Saint Louis School graduate, is expected to compete for playing time at the wide receiver position on the strong side. 

"He was a highly recruited guy," coach Norm Chow said. "We like Devan Stubblefield."

Quinton Pedroza, who redshirted in 2013 after transferring from Utah, has practiced as the No. 1 strong-side receiver. Stubblefield worked with the second unit before suffering the injury during a scrimmage-like session. 

"We’ll play with the guys we have," Chow said of the injuries. "We have to find guys who can get it done."

Haynes definitely out

Wideout Vasquez Haynes confirmed he will miss this coming season while recuperating from shoulder surgery. 

Haynes said he will have surgery Friday in Houston. He said the recovery period is three to four months. 

Haynes said he suffered a torn labrum in his right shoulder during last year’s training camp. 

"I wasn’t 100 percent the whole season," he said. 

He said he hoped non-surgical rehabilitation would strengthen the shoulder. But when the pain persisted, he consulted with Dr. Steven Flores, the Houston Rockets’ physician. Flores recommended surgery. 

Haynes said he will return to Hawaii for the start of the fall semester on Aug. 25. 

Who dat guy?

Tight end Jordan Pu’u-Robinson appeared to be a different person at the end of Monday’s practice. Players are weighed before and after each practice, and it was determined Pu’u-Robinson lost 14 pounds during the two-hour session.

"That was water weight," said Pu’u-Robinson, who regained the weight a few hours later. 

Strength/conditioning coordinator Gary Beemer said Pu’u-Robinson is a "salty sweater. When he sweats, the salt comes out, and the salt draws water with it. We have to give him a lot of fluids, and keep him off his feet when he’s not practicing."

Pu’u-Robinson has had difficulty remaining on the field since transferring from Washington State in August 2012. Injuries to his back, shoulder, knees and hands limited Pu’u-Robinson to four games in the past two years. 

When healthy, Pu’u-Robinson is a multi-skilled player who can line up next to the tackle, in the slot or wide. 

"A lot of moves are made because of need," Chow said of Pu’u-Robinson, who initially joined UH as a defensive end. "He was a tight end (at Baldwin High). We felt like we needed that. … He’s very athletic. (Because of injuries), we’ve never been able to see him (play extensively)."

Beemer modified Pu’u-Robinson’s workouts, relying heavily on single-leg training. 

"I worked on my nutrition," Pu’u-Robinson said. "There was a lot of rehab and maintenance work on my back. I’m working hard in the weight room. The most important things are getting strong, getting flexible, bending those hips … and staying healthy."