The Philadelphia Eagles extended center Jason Kelce’s contract by one year through 2021, the team announced Saturday morning.No terms were announced, but Sirius XM reports the extension raises the value of Kelce’s deal over the next three seasons to $11 million annually, the highest average for an NFL center. Kelce had previously been set to make $6.5 million in 2019 and $7 million in 2020.”Obviously, it’s a tremendous gesture by the team,” Kelce told the team’s website. “They didn’t have to do anything like this. I’m really happy to be in Philadelphia — I have been my whole career. I love being part of this organization. For everything to continue to go this (well), for the team to be how good it is, for the coaches to be as good as they are, I just feel extremely lucky to be in this situation.”Some had wondered if Kelce, 31, would consider retirement this offseason, but that appears to be at least a few years away.