#3 Cristiano Ronaldo | Manchester United star
His return to Old Trafford has been filled with goal droughts and struggles in the dressing room, but it is hard to forget Cristiano Ronaldo's first period with Manchester United. Alex Ferguson noticed Ronaldo's brilliance when the Red Devils faced Sporting, and he was quick to acquire the then-teenage sensation. It didn't take long for the youngster to find his place in the first team.
When he finally found his slot, Cristiano Ronaldo became purely ruthless in human form. Everything about Ronaldo stood out, even in a star-studded United squad, and it wouldn't take the world long to notice.
It became impossible for defenders to stop him in the EPL, and his connection with other strikers made him the deadliest player in the final third. Ronaldo would go on to win the Ballon d'Or before joining Real Madrid.
#2 Wayne Rooney | Manchester United legend
Wayne Rooney's longevity and success at Old Trafford would give many people the impression that he rose from the academy's ranks. However, Rooney was a signing from Everton back in 2004.
The size of his transfer fee - £33.5 million - made the press question Alex Ferguson's prowess in the transfer market, but Rooney quickly started blossoming. The former centre-forward may have been the most expensive teenager at the time, but he lived up to the height and started showcasing brilliance at Old Trafford.
Rooney went on to enjoy 13 trophy-laden seasons at Manchester United, winning every honor available at club level. It hardly mattered which young star joined the club; Rooney would remain a key member of the team throughout his career.
His deadly presence in the final third, as well as his ability to play for other attackers, made Rooney one of the best ever strikers in Manchester United history.
#1 Robin van Persie | former Manchester United star
Manchester United's glory days continued in fine fashion for years, until that faithful day in 2011 when Manchester City snatched the Premier League title from United's tight grasp. It was a hard pill to swallow, especially for Alex Ferguson, and he quickly sought out the deadliest striker in the league at the time: Robin van Persie.
The star agreed to leave rivals Arsenal and head to Old Trafford, where he immediately became the final piece of the puzzle. Although he was brilliant for Arsenal, he only managed one major trophy with the side in nearly a decade.
The transfer to Old Trafford meant the same thing for both Van Persie and Alex Ferguson: the Premier League title. He would go on to score 26 goals in 38 games, guiding the team to a deserved Premier League title in his debut season.