ALAMEDA -- Raiders first-round draft pick, cornerback DJ Hayden, has been hospitalized since last week with what is being described as an "abdominal issue," the team revealed Tuesday.
The 22-year old with a history of a serious heart injury underwent a procedure to remove scar tissue in his abdominal region last week, the Raiders said. There is no timetable for his release, but the 12th overall pick in the 2013 NFL Draft is expected to miss the remainder of the Raiders offseason program.
Hayden was in the hospital during OTAs Tuesday, while the injury was discovered "Tuesday or Wednesday of last week," according to head coach Dennis Allen.
The team hasn't eliminated a connection with the life-threatening chest issue Hayden suffered his senior year at Houston. A collision during a Cougars' practice tore the inferior vena cava in Hayden's heart -- typically a fatal injury.
"We can't rule that out, obviously," Allen said Tuesday. "Right now, I don't know what the correlation is to it, but we don't anticipate it being an issue."
Hayden, who participated in the team's first OTAs on May 20, might not take the field with his team again until training camp July 29 in Napa.
"It's obviously not a good thing," Allen said. "From a football standpoint, as a rookie, you need all the reps you can get, and all the work you can get. That kind of sets us back a little bit."
With cornerbacks Tracy Porter and Coye Francies missing practice Tuesday with a calf injury and illness, respectively, the Raiders are thin at the position. Taiwan Jones, Chimdi Chekwa, Mike Jenkins, Joselio Hanson, Chance Casey and Mitchell White are the other cornerbacks listed on the roster.