Ferdinand believes that the youngster could go on to become a world-beater just like the Portuguese international if he works hard.
Manchester United signed the attacker in a deal worth around £37 million from Atalanta and the 18-year-old is regarded as one of the top young talents in world football.
It will be interesting to see if he can realise his potential at Old Trafford now.
Manchester United needed some quality in the wide areas and it will be interesting to see if the youngster can force his way into Solskjaer’s first-team plans.
Diallo will need time to adapt to the Premier League and he might not be able to show his true qualities this season.
In any case, Rio Ferdinand’s comparison of the youngster with Cristiano Ronaldo will certainly put some pressure on the player and it remains to be seen how he copes with the high hopes surrounding him.
Ferdinand said: “If you see his clips and speak to people at the club who are involved in buying him, potentially this kid could be a world-beater. That is the thought of Manchester United people that this kid is one they have unearthed. I don’t want to put the pressure of Ronaldo on him, but no-one knew about Ronaldo when we bought him other than the people in Portugal. This kid seems similar in that sense and if you see his clips and the way people talk about him, the world is his oyster if he applies himself right.”