Carragher suggested that the 20-year-old would be better served by joining Everton - the club where Lukaku refined himself into a top-class striker - in order to fulfil his huge potential.
However, he has struggled to hold down a regular first-team place under Jose Mourinho at Old Trafford and will be suspended for United's next three domestic games after being sent off at Burnley before the worldwide break.
He now returns to Old Trafford to begin a three-game suspension for a red card picked up 10 minutes after going on as a sub in their win at Burnley in the last game before this worldwide break.
Rashford has featured at times on the flanks but with the likes of Alexis Sanchez, Anthony Martial and Jesse Lingard also in the reckoning, starts have been few and far between.
"Jose thinks the world of Marcus", he said.
Chrome vs Edge vs Firefox: Is Microsoft's browser really faster?
Some analysts say Edge's share has fallen over the past year , so maybe Microsoft needs all the help it can get. Meanwhile, another Twitter user reported the same issue with Chrome, Vivaldi, Opera, and Firefox browsers.
Daily Telegraph columnist Jamie Carragher made the point that Rashford has the most hard of tasks at United - a young player coming through as a striker at a big club.
"Everything he's got - he's got pace, power, he'll learn as he's still young".
Exercise: The youngster will have benefited from his playing time with England.
Lukaku revealed that he plans to retire from Belgium duty following the continental competition in two years' time after helping his nation to third place in the World Cup earlier this year.
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Such intercepts have happened about 60 times between 2007 and 2017, The New York Times reported a year ago . However, during that earlier intercept, the Russian Tu-95s were not escorted by Russian fighter jets.
Rashford has managed double digits in goals the past two seasons, while Ronaldo first achieved that feat in 2005-06, as he turned 21.
But the United academy graduate will have to make a tough decision if he fails to earn a place in Jose Mourinho's starting line up.
It is not as straightforward for Pep as: 'Oh, I'll just give Phil a game.' Every decision you make as a manager has a knock-on effect and I understand how complicated that is.
Meanwhile, Manchester United are preparing to return to Premier League action on Saturday evening when they travel to Watford.
People flee as 'catastrophic' Hurricane Florence sweeps towards America
The Category 4 storm is likely to produce "catastrophic" flooding in the eastern Carolinas, as well as destructive winds. Keep in mind that the storm is just now coming ashore, and the winds and waves will get worse as the hours go on.