Tom Allen's arrival at Clemson is already turning heads, as 247Sports has ranked him the No. 2 best coordinator hire in college football for 2025. The only coach ahead of him on the list? Jim Knowles, his replacement at Penn State and former Ohio State defensive coordinator.

Allen's hiring was a significant move for Clemson, as Dabo Swinney brought in the former Indiana head coach to reshape a defense that struggled against the run last season. Despite boasting talent at all levels, the Tigers gave up 160.6 rushing yards per game -- their highest mark since 2011. Allen, who spent the 2024 season leading a dominant Penn State defense, is focused on building a scheme that maximizes his players' strengths.

"There's no magic system," Allen said recently. "It's about creating a plan that matches the current roster."

At Penn State, Allen's defense ranked among the nation's best, finishing seventh in total defense, eighth in scoring defense, and ninth in rushing defense. His ability to generate pressure was especially impressive, with the Nittany Lions ranking second in tackles for loss and fifth in sacks. That success has Clemson fans optimistic about what he can do with the Tigers' personnel.

Allen has already expressed confidence in the talent he's inheriting, highlighting the size and athleticism of the defensive line and the elite playmakers at linebacker and in the secondary. The key, he believes, is developing the unit's identity and confidence.

With his extensive experience -- including a seven-year stint as Indiana's head coach -- Allen brings a well-respected defensive mind to Clemson. His three-year deal, starting at $1.9 million in 2025, reflects the Tigers' commitment to revamping their defense.

Allen was ranked No. 2, the list's third spot went to new Alabama offensive coordinator Ryan Grubb, who joins from the Seattle Seahawks. However, it's Allen who will be in the spotlight this season as he looks to return Clemson's defense to elite form.