#3 Dennis Law
The Scottish footballer joined Manchester United in 1962. By then Dennis Law had already played a season for arch-rivals Manchester City but if there were any skeptics among the United faithful, they were silenced when he scored seven minutes into his debut against West Bromwich Albion. It was a sign of things to come because the Scottish striker would eventually turn into a goal machine for his club and he still is United's third-highest goal scorer.
Dennis Law played for 11 seasons at Old Trafford, appearing 404 times and scoring 237 goals. He won the First Division title twice, one FA Cup, two Charity Shields, and one European Cup. In 1964, Law won the Ballon d’Or and he still is the only Scottish footballer to have won the award. He set the record of scoring the most number of goals in a season for Manchester United when he found the back of the net 46 times in the 1963/64 season.
On the pitch, Law was a natural goal scorer. He was lovingly called the King by United fans, while the opposition often referred to him as Dennis the Menace. Every time he had the ball at his feet, fans around the stadium would get off their seat in anticipation, such was his ability to find the back of the net.