"[Kenny] is meeting with his family and figuring out what he wants to do," Sumlin told 105.3 The Fan in Dallas.
Big 12 champion TCU is a strong possibility for Hill, a source told ESPN.com's Travis Haney.
Hill replaced former Heisman Trophy winner Johnny Manziel for the Aggies and surged to the forefront of the early Heisman race with a 511-yard, three-touchdown demolition of fellow SEC opponent South Carolina to open the 2014 season.
Soon after, Hill's parents filed for a trademark for the nickname "Trill," which Hill adopted in the wake of the revelatory performance.
Hill and the Aggies continued their march through September, preying mostly on weaker nonconference foes to land at 5-0 and earn a No. 6 ranking after the season's first month.
Then things changed. Texas A&M lost its next three games and five of its final seven. By November, Hill was replaced by freshman Kyle Allen, who led the team to wins against Louisiana-Monroe, Auburn and West Virginia to salvage an 8-5 finish.
When Allen took over, Hill was serving a two-game suspension for a violation of team rules and athletic department policy. Aggies coaches, though, insisted Allen would have taken over regardless of Hill's status.
Hill also was suspended for the final part of spring practice in 2014 after an alcohol-related arrest.
Hill's final numbers for 2014 -- 2,649 yards, 23 touchdowns, eight interceptions and a 67 percent completion rate -- were still exceptional.
If TCU is Hill's destination, he will be forced to sit out 2015 in accordance with the NCAA's transfer rule.