Ronaldo is expected to start his first Champions League game since last May's final triumph over Chelsea in Moscow on Tuesday when United tackle Danish minnows Aalborg looking to record their first win of the current campaign.
The 23-year-old has only just returned from ankle surgery but already he has shot to the top of United's goalscoring charts, netting against Middlesbrough before taking advantage of Rob Styles' generosity by converting the Red Devils' controversial penalty in Saturday's win over Bolton at Old Trafford.
And Eusebio believes his fellow countryman is nailed on to be crowned world number one later in the year.
"Officially, the best player is Kaka," Eusebio told www.uefa.com.
"However, I believe today that Cristiano is the best without any doubt.
"I have always said that he has everything it takes to become the best player in the world."
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Ronaldo has shown no lingering effects from his tumultuous summer, which saw him not only perform disappointingly for Portugal at Euro 2008 and then go under the knife but also become embroiled in a lengthy transfer saga with Real Madrid before, as Eusebio expected, deciding to stay with United.
Now he is a global icon, Ronaldo may find it difficult to keep his feet on the ground.
However, providing he heeds Eusebio's advice to "keep his head in the right place" it appears there is no limit to his talent.
"I always believed that he would stay in Manchester," said Eusebio.
"Depending on his condition and whether his head is in the right place, I think he can get better, because with every year that passes he will gain experience and he'll know how to improve on the pitch.
"He must not forget that he will have to work a lot in terms of pace and ball control, and he is actually good in this respect.
"Therefore, the advice I always give him is that he needs to keep forging ahead in a straight line. Then he will definitely go a long way."
Is Ronaldo the best player in the world? Have your say.
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Showing comments 1 to 12 and replies | View All
edinburgh red, edinburgh (29/09/2008 at 14:20)
Gilly, Belgium (29/09/2008 at 14:22)
John Bond who's the daddy (29/09/2008 at 15:44)
bobbydazzler (29/09/2008 at 16:22)
There's Only One Keano, Baltimore, USA (29/09/2008 at 16:29)
shola-shoneils, Finland (29/09/2008 at 18:34)
reddevil4ever, India (29/09/2008 at 19:50)
ted knott, droylsden (29/09/2008 at 20:53)
Fergie hasn't a CLUE, Madoc Ontario Canada (30/09/2008 at 02:36)
Good Luck Ronnie.
Andy P, Wythenshawe, Manchester (30/09/2008 at 08:51)
TMUF, Manchester (30/09/2008 at 09:30)
Ted Knott has shown how little he knows about football and the reason he should be ignored as Kaka doesn't come in the top 5 of either category.
Ronaldo is streets ahead of anyone in the world. Top scorer in the PL, CL and all the European leagues!
There are players like Messi, who have had some success but have helped their team achieve nothing in the past 2 years.
Aguero for me would be the only one close.
But at the end of the day, 42 goals, PL and CL medal says it all.
Not to mention he was the only player to do anthing for Portugal taking part in practically all their goals all while being injured.
He scored against evry member of the top 4 including the CL final so if he doesn't win it the award, then its jealous bigwigs not happy to see the Premier League shining!
Nasty.. , East Stand, Level 1 (30/09/2008 at 10:59)
ted knott, droylsden
29/09/2008 at 20:53
On the button Ted we have to rid the game of cheats the sooner the better !