In what was disastrous campaign for United on the defensive front in 2014/15, it comes as no surprise that Louis van Gaal is looking to strengthen that particular area of his squad.
A lot of credit goes to David de Gea for keeping United in games that they could have easily lost due to defensive mishaps, but there was a frequent selection at right-back that didn't help.
Rafael Da Silva did not receive many opportunities last season and lost his spot in the team to Ecuador international Antonio Valencia, who is more of a winger than full-back. Defensively, neither are superb, but at least the Brazilian has a genuine understanding of the role.
However, Fabinho, who would not be considered a marquee signing of any sort, has spent two years on loan at AS Monaco from Rio Ave in Portugal. The French side took up their option to sign the defender permanently last month on a four-year contract.
According to L’Equipe, Manchester United were preparing an offer of £10 million but the French outfit want double that for the 21-year-old, who is currently away on international duty with Brazil at the Copa America.
Fabinho is represented by super agent Jorge Mendes, who negotiated Radamel Falcao's loan move to Old Trafford a year ago.
Does Rafael need replacing?
It was a unfortunate campaign for Rafael Da Silva last term and one he won't look back on too fondly.
The 24-year-old has been criticised before for being reckless when tackling but that's more to do with maturity as he has improved with time. He offers more defensively than Antonio Valencia and both are an asset going forward.
What Manchester United need is more options at right-back, so it would be a mistake to let Rafael go. He is a fans' favourite who understands the club. Many supporters would be sad to see him leave, but upgrades are required.