Manuel Pellegrini stunned West Ham United supporters by naming Ben Johnson in his starting lineup to face Manchester City at the Etihad.
The right-back (who will start at left-back) has never made a senior appearance for the Hammers before Wednesday evening.
However, the Chilean boss decided to start the 19-year-old in Manchester to face the Premier League champions.
With Aaron Cresswell picking up a knock during the win against Fulham on Friday, Pellegrini placed his trust in Johnson over Arthur Masuaku.
But who is he? Scroll down to learn all you need to know about the West Ham debutant.
WHERE DID HE COME FROM?
Johnson, who spent his formative years as a winger, has been at West Ham since the age of seven and turned 19 just last month.
Last January, he signed his first professional contract to keep him at the club until 2020.
He travelled with the squad to Marbella during the recent warm weather training camp.
IS HE READY FOR HIS DEBUT?
Last season, David Moyes decided to bring Johnson to the Etihad and named him on the substitutes bench for the game at Manchester City.
Johnson had been training with the first team under the watchful eye of Slaven Bilic and the Scot was happy to bring him with the matchday squad to face Pep Gaurdiola’s men, although he never got off the bench.
He has made 15 appearances for the Hammers’ Premier League 2 side this campaign, helping the Hammers to away wins at Tottenham Hotspur, Blackburn Rovers and…Manchester City.
WHAT CAN WEST HAM FANS EXPECT?
Although not a natural left-back, Johnson is extremely highly-rated for his versatility.
With Andy Carroll up front, West Ham may well opt to play a more direct brand of football to unsettle Guardiola’s team, something which will suit Johnson.
Upon signing his deal for the club, the starlet said: ““I play at right back at the moment and I think I get up and down and get crosses in.
“I think I need to improve my defending but I think overall I’m reliable on the pitch and that’s what you need in the team.”