Tebow, 28 in August, last played in the NFL in 2012. The Eagles workout marked his first reported NFL interest since his first stint in the league ended when the New England Patriots released him during training camp in 2013.
Tebow left Philadelphia without a contract offer.
In an interview that will air Monday at 7 p.m. ET on NFL Total Access, Kelly said Tebow's workout was regular due diligence NFL teams pay toward veteran free agents.
"We bring in a lot of players for private workouts, it's just he's the one that everyone keeps talking about," Kelly told NFL Media's Steve Wyche. "We brought in Terrelle Pryor for a workout and Thad Lewis in for a workout. When players are available for you to work them out it's the same thing of going to the Veteran Combine or going to the Super Regional Combine."
The Eagles have made several moves this offseason, including trading quarterback Nick Foles to the St. Louis Rams in exchange for Sam Bradford and re-signing Mark Sanchez. They also signed former Cowboys running back DeMarco Murray after trading LeSean McCoy to the Bills for linebacker Kiko Alonso.
- Mike Fiammetta