"Cristiano Ronaldo was a frustrating Manchester United player"

A former Manchester United player talked about his former colleague Cristiano Ronaldo, whom he found frustrating at Old Trafford.

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Having joined United in adolescence, the Portuguese striker has not always had an easy life in Manchester, especially in his first seasons.

One of the club's former players, Jonathan Spector, has recently recalled a time when Ronaldo was not the superstar that he is today, a time when his product final has created frustration for his teammates and supporters.

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"It was a frustrating player, you can see that he has so much capacity but that it's not a finished product for now," Spector said. AmericanGambler.com.

"I think he owes a lot to the player that he is today, not only to the manager but also to the players who surrounded him.

"(Sir Alex) Ferguson has done a great job in ensuring that the players on the team can help the players around them to become better players.

"I think these formative years in its development to make the finished product, it could not have been better located than Manchester United.

"We could see that his last ball would not be quite there, we could sometimes see that Ruud van Nistelrooy could be really frustrated because he did not know how many steps Ronaldo was going to do before putting the ball in the surface him, but his ability on the ball, to beat the players one-on-one, it was clear to him that he was going to be a very special player. "

Ronaldo scored six goals in his first season at the club and nine times in his second season. It would not be long before he became one of the most prolific scorers of the team, scoring 118 goals in 292 games for General United.

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The striker joined Real Madrid after six years in England, becoming one of the greatest football players ever seen.

What do you think was the most important factor in Ronaldo's development during his years at United? Let us know in the comments section below.