NFL's Detroit Lions sign United States rugby sevens star Carlin Isles

 "The fastest man in rugby" could soon be showing his sprinting skills in the NFL after the Detroit Lions signed United States sevens international Carlin Isles.

Isles was a college sprinter in the 60 meters at Ashland United and has completed the 40-yard dash in under 4.3 seconds. His fastest 100m time of 10.13s would have qualified for the semifinals at the London 2012 Olympics.

A winger in rugby, he will be a wide receiver in the Lions' practice squad.

The 24-year-old, who took up rugby in 2012, was given his chance following a trial after tight end Matt Veldman was promoted to the Lions' active roster.