Rugby star-turned Kansas City Chief Louis-Rees Zammit was spotted in the crowd at Stamford Bridge during Chelsea's stunning 4-3 comeback win over Manchester United on Thursday.
Rees-Zammit, who joined the two-time reigning Super Bowl champions last week, was seen on camera among the traveling United fans in the away end.
The 23-year-old is a noted fan of the Red Devils, who took a second-half lead through an Alejandro Garnacho header - before a pair of Cole Palmer goals deep into stoppage time gave Chelsea all three points.
Rees-Zammit shocked the rugby world when he quit the sport in January and embarked on the International Player Pathway to pursue a career in the NFL.
And he impressed at his IPP pro day last month as he posted a 4.43 40-yard dash, as well as a 29-inch vertical jump.
Ultimately, after reportedly meeting with several teams, he signed with the Chiefs.
According to Spotrac, Rees-Zammit's deal is worth a total $2.85million over three years.
The Chiefs confirmed the signing of 'Rees-Lightning' on social media Friday afternoon asking Chiefs Kingdom to give the Welshman a warm welcome.
'Hey Chiefs Kingdom, Louis Rees-Zammit here. Just signed, can't wait to go and see you all at Arrowhead,' Rees-Zammit said in a short video message shared to the Chiefs' social media.
The former British and Irish Lions youngster is also understood to have visited the New York Jets , Cleveland Browns and Denver Broncos after making a superb impression at the IPP with his pace and power, according to NFL Network's Ian Rapoport.
He will wear the No 9 jersey on Kansas City, and is expected to play running back.
With Thursday's defeat, Rees-Zammit's favored United are now 11 points back of fourth-place Aston Villa with just eight games to play.
Chelsea, meanwhile, moved up to 10th.
LovinglyRais
351
and yet CHELSEA is the new COMEBACK king with COLE Palmer their CREAM of the CAKE 😃💙