Sources -- Oklahoma's Jackson Arnold to enter transfer portal - ESPN

Oklahoma starting quarterback Jackson Arnold is entering the NCAA transfer portal, sources told ESPN on Wednesday.

Arnold will have two seasons of eligibility remaining at his next school. The 6-foot-1, 210-pound sophomore from Denton, Texas, was the No. 3 recruit in the ESPN 300 for 2023 and started 10 games over his two seasons with the Sooners.

Arnold threw for 1,421 yards on 63% passing with 12 touchdowns and three interceptions in his first season as Oklahoma's starter and also rushed for 444 yards and three more scores.

The preseason No. 16 Sooners went 6-6 in their first year in the SEC while struggling with injuries and inconsistency on offense. Oklahoma coach Brent Venables fired first-year offensive coordinator Seth Littrell after a 4-3 start.

There's expected to be significant Power 4 interest in Arnold when he officially enters the portal Monday, the first day underclassmen can transfer during the winter portal window.

Arnold, a former Gatorade Player of the Year, served as Dillon Gabriel's backup during his first season with the Sooners and was elevated to become their starter for their Alamo Bowl loss to Arizona in December.

Arnold was benched during the second quarter of Oklahoma's 25-15 loss to Tennessee on Sept. 21 after three early turnovers in the program's first SEC conference game. True freshman Michael Hawkins Jr. replaced him to finish the game and started the Sooners' next two conference games against Auburn and Texas.

After Hawkins had three first-quarter turnovers against South Carolina, Arnold again took over as the Sooners' starter and held onto the job for the rest of the season. Following the 35-9 home loss to the Gamecocks, Venables fired Littrell and made co-OC Joe Jon Finley the interim