PHILADELPHIA -- The Eagles made a bold move to swap quarterback Nick Foles to the Rams for Sam Bradford, but it's anyone's guess just how long Bradford will remain Philadelphia. He is signed through the 2015 season, but can become a free agent in 2016.

ESPN reported this week that the Eagles are discussing a short-term contract extension with Bradford, who is set to make $12.985 million this season. Kelly wouldn't address the report, saying he does not discuss contracts publicly.

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"Last week, there was a report that we weren't talking to him [about a contract extension]," Kelly said on Tuesday. "Believe what you want to believe. We don't talk about contracts."

Speaking of quarterbacks, Kelly had some positive things to say about third-stringer Tim Tebow, the former Jets backup to Mark Sanchez, who is now the Eagles' No. 2 quarterback.

"I thought he threw the ball really well [on Tuesday]," Kelly said of Tebow. "There were a couple of stretches. We'll see how that manifests itself."

Kelly acknowledged that it's difficult to tell much about any of his quarterbacks "until you get him in a game."

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The Eagles quarterbacks were unavailable for interviews on Tuesday.