Marks, a redshirt junior for the Tigers, will announce at a press conference in Auburn on Tuesday that he is going to enter the 2009 NFL Draft.
"I talked with Sen'Derrick before Christmas and I told him I hoped he would be coming back for his senior season," says Don Dunn, who coached the interior defensive line for the Tigers for 10 seasons on Coach Tommy Tuberville's staff.
With Tuberville out as head coach of the Tigers, Dunn is currently looking for another coaching job and says he is optimistic on that front.
"Sen'Derrick is a great young man, but I was really hoping he would come back and play next season," Dunn says. "He went into the season with high expectations, but he didn't have a great year. He had problems with injuries.
"I really believe he could benefit from another year in college and that is what I told him," Dunn says. "He needs to get stronger and he needs to get bigger. I hate it for the Auburn defense."
On Monday night new Auburn head coach Gene Chizik said he had talked to Marks and two other juniors, defensive end Antonio Coleman and Jerraud Powers, and he had hopes that all three would return for their redshirt senior seasons.
Dunn says he has a lot of respect for Marks. "He was a real pleasure for me to coach and I wish him nothing but the best. When I talked to Sen'Derrick I told him that whatever he does he needs to make sure he finishes his degree. He is very close to graduating and he promised me that he would do that."
A preseason All-America selection, Marks suffered sprains to both ankles this season and finished the year with 15 solo tackles and 17 assists. He made second team All-SEC by the league's coaches and was an honorable mention all-league pick by AP. He had 10 tackles for lost yardage, two sacks, two deflected passes and blocked a field goal.
A starter since his redshirt freshman season in 2006 who played both tackle and end, Marks had 82 career tackles and 5 1/2 sacks coming into his junior season. He was an All-SEC Freshman in 2006 with 26 solo tackles and 12 assists.