The Sun Devils, which signed Bosco four-star offensive linemen Zach Robertson in February, remain a strong option.
"All three of us are still looking at ASU but we're not still too sure yet," Beck said. "We just wanted to get it over with, our commitment, and keep our focus on the season and winning another national championship.
"We're still planning on doing it on the 20th. I'm really excited, can't wait."
Recently, Beck said he's been offered a scholarship by Washington State and Wisconsin, with Boise State and Colorado believed to be close. He already had offers from Fresno State, Nevada, San Jose State and San Diego State.
"I've been talking to a lot of coaches, picking up a few more offers," Beck said. "I think I'm ready to make my choice but I'm not all the way sure yet."
The 5-foot-10, 170 pound cornerback, ranked No. 7 at the position in the West, said he's spent time watching the ASU defense last season and was impressed by its blitzing approach and range of coverages.
"They said I can be a real good playmaker in their secondary," Beck said in a previous interview. "My quickness, speed, ability to make plays on the ball, they said they really like that and I would be a great fit in their defense."
While Beck seems strongly pro-ASU, he said he wasn't always the most likely of the three Bosco players to end up in Tempe.
"They were the ones that actually got me more onto ASU," Beck said of McGrew and Morgan. "We all like ASU, I know that. We'll just have to see on the 20th what happens."