Virginia has added just one player so far in the transfer portal, and still has a few positions of need to fill out its roster for the 2026-2027 season. To get back to the level they were at last year, they must address these key positions to be a contending team next winter. Let’s take a closer look.   Backup Center  Virginia is still in need for a backup center to help in the rotation of what they have with Johann Grünloh, who improved last season as the day wore on. Grünloh is a solid starter with star potential, but the Cavaliers need someone who can rotate in for him. They haven’t added a player from the portal yet, and they don’t have another center on the roster. That could be potentially problematic for the Hoos. Last season, Virginia was so good because of the play of Ugonna Onyenso when he came into the game and how he was able to lock down the paint.…