TAMPA – DeSean Jackson practiced Friday but was still under concussion protocol, so that's why the Bucs feel good about their wide receiver depth. Not just because of injuries, but to combat what is expected to be a very hot day.Sunday's high temperature is forecast to be 91 degrees when the Bucs host the Eagles. That would be the team's hottest home opener since 2013."Not just because it's the regular season, but because of this heat,'' coach Dirk Koetter said. "Sunday at 1 o'clock, we were talking about it, it's going to be a similar day to last year's Chicago (game). Okay, remember, that was a smoking hot day when we played Chicago last year."It's the same for both teams, but you've only got 46 guys. There's the same volume of running in games as always, and it's up to each team to decide how they're going to rotate their guys.''The Bucs had five receivers active in last week's season-opening win at New Orleans: Jackson, Mike Evans, Chris Godwin, Adam Humphries and Freddie Martino. If Jackson can't go, the Bucs might have rookie Justin Watson in uniform.InjuriesJackson (concussion/shoulder) and DE Jason Pierre-Paul (knee) were limited in practice and were listed as questionable. LT Donovan Smith (knee) and G Caleb Benenoch (knee) had full participation and will play. CB Brent Grimes (groin) and DT Vita Vea (calf) are out.