When the puzzle is complete and the pieces are comfortably in place, Jason Kelce believes the Chip Kelly-designed offense will function harmoniously and efficiently.

That’s what fans and media have anticipated since the Eagles hired the former Oregon head coach whose no-huddle, spread offenses in college shattered records and emerged as one of the country’s most prolific attacks.

But the Eagles have several more Organized Team Activities (OTAs) and several weeks of training camp ahead to hammer down the intricate details and morph into a finish product, and Kelce is expected to be at the nucleus of the attack.

The third-year center, still rehabbing from a major knee injury that ended his 2012 season after two games and required ligament surgery, has only participated in small portions of practices this spring.

When the offense takes the field for 7-on-7 drills or full-team drills, Kelce works with the trainer, but change is on the horizon. On Tuesday, Kelce said he received medical clearance to ratchet up his workload in the next camp (June 4-6) and he expects to participate in all practices in training camp.

“I’ll be cleared the day before training camp,” Kelce said. “The next minicamp, I just got cleared by the docs. I’ll be doing two or three plays every period and 11-on-11 with the defense out there. So I’m still on track yet.”

When he returns, Kelce will assume the larger role he inherited last season after an impressive rookie year in which he started all 16 games as a sixth-round rookie.