Arkansas was a young team in 2015 with just 13 seniors on the roster. But that’s not to say that the Razorbacks won’t feel the effects of losing several prominent upperclassmen in 2016, chiefly on offense.

The Hogs will have new starters at quarterback, running back and tight end, as well as potentially four new faces along its offensive line. The defense should remain largely intact.

Here’s a look at five players whom the Arkansas Razorbacks will miss during the 2016 season.

RB Alex Collins: Arkansas will enter the 2016 season without the No. 2 rusher in program history, as Alex Collins has elected to forego his senior campaign. The junior leaves Fayetteville with 3,703 career rushing yards and 36 touchdowns and is just the third player in SEC history to rush for more than 1,000 yards in each of his first three seasons. Arkansas is in search of a dynamic back to replace one of the most electric rushers in school history. Head coach Bret Bielema hopes recent recruiting coup Devwah Whaley, a four-star prospect from Beaumont, Texas, can fill Collins’ role. The two backs are similar in size, tipping the scales in the 6-foot, 215-pound neighborhood.

QB Brandon Allen: Brandon Allen developed into a leader and potential NFL talent during his senior year, particularly in the second half of the season. The hometown product exits Fayetteville as Arkansas’ all-time touchdown leader (64 TDs) and ranks third in career passing yards (7,463 yards), 30 yards behind Ryan Mallet for second place. Allen brought a gritty gamesmanship each week, willing the Hogs to eight victories, several of them of the thrilling overtime variety, occasionally on a gimpy leg. The Razorbacks have many options under center, paving the way for an intriguing spring practice as Cole Kelley, Rafe Peavey, Ty Storey, Ricky Town and Allen’s younger brother, Austin Allen, all begin the process of competing for first-team snaps.

LT Denver Kirkland: Arkansas’ high-powered offense began with the team’s offensive line, the biggest in all of football — NFL included. Denver Kirkland was an anchor along the Hogs’ offensive front, but the junior has decided to haul his 6-foot-5, 340-pound frame to the NFL trenches. With Kirkland protecting quarterback Brandon Allen’s blindside, the Razorbacks rung up the SEC’s No. 2 offense with 465.5 YPG (No. 29 in the nation).

LG Sebastian Tretola: It’s not a matter of simply shifting bodies down one spot to replace  Kirkland on Arkansas’ offensive line. The Razorbacks lose their entire left side with the graduation of left guard Sebastian Tretola, another brick stalwart. Tretola (6-foot-5, 334 pounds) is sure to get his shot to play on Sundays. Arkansas also loses center Mitch Smothers (6-foot-3, 322 pounds) to graduation and possibly junior RT Dan Skipper (6-foot-10, 331 pounds) early to the NFL Draft process. The Hogs return sophomore RG Frank Ragnow and currently have two guards — including coveted three-star, Northwest Mississippi Community College transfer Terrance Malone — in their 2016 recruiting class. Bielema has added Kurt Anderson, formerly an assistant coach with the Buffalo Bills, to take over as Razorbacks offensive line coach. The duo will hit the recruiting trail hard, starting with Thursday’s opening of the recruiting contact period. Arkansas still has several offensive linemen on their wish list to fill out their 2016 recruiting class.

RB Jonathan Williams: Jonathan Williams didn’t register a single carry in 2015, but the Arkansas backfield could potentially feel the running back’s absence in 2016. Unlike Collins, Williams returned for his senior year, but was sidelined by foot surgery during the preseason and missed all but the very last play of the year (a ceremonial kneel-down in victory formation during the Liberty Bowl). Rather than utilizing a redshirt, Williams opted to take his 2,321 career yards and 26 touchdowns to the NFL alongside Collins. The absence of the prolific duo  leaves rising senior Kody Walker as the program’s active leading rusher (664 career rushing yards, 13 TDs). Otherwise, the balance of the Hogs backfield experience rests on the legs of Rawleigh Williams III (7 games), who is hoping to recover from a season-ending neck injury in time for the 2016 season.