PHILADELPHIA (973espn.com) - It hasn't always been smooth but the Eagles feel Isaac Seumalo has turned the corner and the fourth-year left guard was signed to an extension on Monday which runs through the 2022 season.

Originally a third-round pick in the 2016 NFL draft Seumalo has ping-ponged back and forth as the starting left guard over the past two seasons. He was given the job at the start of his sophomore season before being benched after just two games, first for Chance Warmack before the more accomplished Stefen Wisniewski finally solidified things through the Super Bowl LII title run.

Last season Wiz began as the starter but Seumalo took over after four games and finished the season. Offensive line coach Jeff Stoutland has always been enamored with Seumalo's athleticism, versatility and smarts.

Ironically Seumalo played every position on the O-Line in college at Oregon State except left guard. With the Eagles, he's played everywhere but left tackle.

Seumalo, who was graded by ProFootballFocus.com as the 36th best guard in the NFL last season, was set to enter the final season on his rookie deal in 2019 and the new agreement takes him through the 2022 season.

All-Pro center Jason Kelce was signed to a one-year extension last week and both Lane Johnson and Brandon Brooks are Pro Bowl caliber players on the right side although the latter is currently rehabbing from a torn Achilles that cut short his 2018 season. The only question left for the Eagles on the starting O-Line is veteran left tackle Jason Peters, who is currently under contract but has a cap number over $13 million that Philadelphia would like to restructure.

-John McMullen covers the Eagles and the NFL for 973espn.com. You can reach him at jmcmullen44@gmail.com or on Twitter @JFMcMullen