United Kingdom, Dec. 19 -- Rob Gronkowski thinks Travis Kelce will retire at the end of the NFL season.

The 36-year-old sports star - who is engaged to Taylor Swift - is rumoured to be contemplating retirement after an underwhelming season with the Kansas City Chiefs, and Rob, a legendary former player, believes Travis is likely to announce his retirement in the coming weeks or months.

Rob, 36, said on Up and Adams: "My gut tells me about Travis Kelce is that he will not be back next year.

"He has had a significant career ... He has had an excellent year once again this year. He is a top tight end in the NFL. I'm not sure exactly what his stats are, but I know he's producing.

"And if any team can get the type of production that he's h...