Alejandro Garnacho's true cost from Atletico Madrid leaves ...

Manchester United supporters have been left shocked at the transfer fee the Red Devils paid Atletico Madrid when signing youngster Alejandro Garnacho in 2020.

The 18-year-old joined United's academy just under three years ago and this campaign has seen the Argentine breakthrough into the first-team, amounting 33 appearances, scoring five goals and providing five assists.

This season has already been a success for United in Erik ten Hag's first campaign as manager with Champions League football secured as well as lifting the League Cup back in February.

However, more success could arrive this afternoon as United take on city-rivals Manchester City in the first-ever Manchester Derby FA Cup final.

Garnacho is expected to play a role at Wembley this afternoon with the youngster becoming an instant fan favourite at Old Trafford with the teenager's future certainly looking exceptionally bright.

Incredibly, the winger was able to be signed by United for just a £100,000 compensation fee from Atletico Madrid, according to the Athletic.

They claim that scout Gerardo Guzman identified the youngster to the Red Devils' head of youth recruitment David Harrison with director of football John Murtough sanctioning the cut-price deal.

Fans have hailed the club for signing Garnacho, one said: "Biggest bargain ever."

Another added: "This is what we need to do more of rather than continuously wasting £100m on players."

A third reacted: "Well spent. Can’t remember the last time we spent wisely."

Some even joked that the amount it took to buy Garnacho is as much as some of his team-mates' weekly wages.

The 18-year-old is firmly in ten Hag's plans for the future with the Argentine signing a lucrative five-year deal recently with the Dutchman looking to bring glory back to the red half of Manchester.