Griffin, who will probably be named college basketball's national player of the year after averaging 22.7 points and 14.4 rebounds, would likely be the No. 1 pick in June's NBA draft if he forgoes his final two seasons of college eligibility.
Capel might have watched Griffin play his final college game Sunday, when the No. 2-seeded Sooners lost to No. 1 seed North Carolina 72-60 in the South Regional final at FedExForum. Griffin had 23 points and 16 rebounds in the loss, which prevented the Sooners from reaching next weekend's Final Four in Detroit.
Capel said he plans to meet with Griffin and his parents sometime this week to discuss the star sophomore's future.
Capel didn't sound confident when asked if his odds of keeping Griffin another season are slim.
"It probably is, but we'll see," Capel said. "That will be a decision that Blake will make for himself, and it will be the same thing that happened last year. We'll sit down. We'll talk. And I'll get whatever information. I think it's easier this year to get that information. He'll do what's best for him and his family, and we all will support him 1,000 percent."
Taylor Griffin, Blake's older brother, is a senior forward for the Sooners.
Capel also isn't sure if he'll keep starting guard Willie Warren, a potential NBA first-round draft choice, after he averaged 14.5 points and 3.1 assists as a freshman.
North Carolina coach Roy Williams was certainly impressed by Blake Griffin's play on Sunday.
"He's a load," Williams said. "Please don't make this to be a comparison -- [but] he is LeBron James-like. He's got such a package of strength, explosiveness, touch, power. You know, it's hard to match that. In person, when you're sitting on that bench, it even looks more awesome than it does when I'm watching it on TV."
Mark Schlabach covers college sports for ESPN.com.