Following the visit, Alvarez said the OU coaches said they would call Monday or Tuesday to let him know about his offer status.
Alvarez was offered Tuesday during school and committed later in the night.
"It's a great school and a great program," Alvarez said. "I got that OU offer and couldn't let it slip through my fingers and wonder what I'm going to do in the future."
Alvarez, who is listed at 6-foot-3 and 280 pounds, is a two-star prospect who said Houston and TCU were the other main schools he was considering.
TCU coaches were actually going to see Alvarez play this weekend. He said he will call the coaches to tell them not to come because he is 100 percent behind the Sooners.
"I wanted to get them to realize I was a great guy and somebody who deserved an offer," Alvarez said. "Last weekend they said they really liked me and were close to offering me."
Alvarez said he loved his trip to OU last weekend, saying he was impressed with how big and how loud the crowd was.
While it was nice for OU coaches to let him they would notify him Monday or Tuesday about an offer, it made the last 48 hours pretty crazy.
"I was pretty nervous yesterday," Alvarez said. "But I found out I got the offer. I got in touch with Coach Gundy and then Coach Bedenbaugh, and they said they were really happy I chose them."
The addition of Alvarez gives OU two interior linemen commits, joining Troy (Ohio) three-star center Alex Dalton. It's clear what Bedenbaugh is looking for in his recruits when Alvarez describes what sets him apart from other linemen.
"I'm a very physical guy," Alvarez said. "If I get you on the ground, I'm not letting you back up. I'm going to dominate."