Robert Kraft isn't concerned about Rob Gronkowski's future.

The New England Patriots owner is aware that Gronkowski has considered retirement.

"It's not even an issue for me," Kraft said. "I didn't know about it until I read about it in the paper. I saw (Gronkowski recently at Gillette Stadium). We have a fun, good relationship. He is one of the most up people I know. I was impressed that he was coming in late and doing whatever he had to do to make himself feel right and get his body right."

There were reports that the tight end could be traded, but the Patriots have never considered moving Gronkowski.