Bryan Mbeumo, 25, will reportedly cost the 20-time Premier League champions an initial £65 million ($87 million) having scored 20 goals in 38 league games last season for the Bees.

Tottenham, now managed by former Brentford boss Thomas Frank, were also chasing the France-born attacker before United's improved offer sealed the move.

United's third bid, worth an initial £65m with £6m in add-ons, was accepted last week.

"As soon as I knew there was a chance to join Manchester United, I had to take the opportunity to sign for the club of my dreams," Mbeumo said in a United statement.

"The team whose shirt I wore growing up.

"This is a massive club, with an incredible stadium and amazing fans, we are all really determined to challenge for the biggest trophies," he added.

United coach Ruben Amorim has signed two other players during this summer in an attempt to avoid a repeat of last season's catastrophic display.

They lost to Tottenham in the Europa League final and a 15th-place finish in the top flight was their lowest since 1973-74.

Wolves forward Matheus Cunha and teenage Paraguayan defender Diego Leon have also moved to Old Trafford.

- 'Primary target' -

Rasmus Hojlund and Joshua Zirkzee struggled as Amorim's main strikers last term.

"My mentality is to always be better than I was yesterday," Mbeumo said.

"I know that I have the spirit and character to reach another level here learning from Ruben Amorim and playing alongside world-class players.

Mbeumo blossomed in six years at Brentford, scoring 70 goals and providing 51 assists in 242 appearances in all competitions following his move from French club Troyes in 2019.

"There is always a right time for a player to move on and, for Bryan, that time is now," Brentford director of football Phil Giles said.

"He has the opportunity to go to one of the biggest clubs in the world, and we are very happy for him," he added.

Mbeumo helped the Bees win promotion to the Premier League in 2021 and was instrumental in their impressive 10th-place finish in 2024-25.

"We are delighted to have secured another one of our primary targets ahead of the pre-season tour," the Red Devils' director of football Jason Wilcox said.

"The experience in the US will be the perfect opportunity for Bryan to work with Ruben and his new team-mates as we prepare for an exciting season ahead," he added.

In terms of United outgoings, Marcus Rashford is set to leave his boyhood club for Barcelona and an announcement could come on Tuesday.

Jadon Sancho, Alejandro Garnacho, Antony and Tyrell Malacia continue looking for new clubs and are not expected to fly to the US as part of the tour squad.

United start their pre-season tour of the United States on Sunday by facing West Ham before their opening game of the new Premier League season against Arsenal on August 17.