Jose Mourinho's first summer in charge at Manchester United has - so far - been a successful one.
Eric Bailly, Henrikh Mkhitaryan and Zlatan Ibrahimovic have all joined since the Portuguese's arrival on May 27, with Paul Pogba's £112 million move due to be announced in the coming days.
However, with the 2016/17 Premier League season fast approaching, it would seem Mourinho faces a problem - and a big one at that.
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Recent reports suggest he has told a number of players they are no longer needed at Old Trafford yet a select few, simply, refuse to leave.
Marcos Rojo is one of such individuals.
According to Sky Sports, the Argentine has no interest in leaving amidst a desire to stay and prove his worth.
Since signing for the Red Devils in 2014 for £16 million, Rojo has failed to impress and become the subject of much scrutiny amongst fans.
A big-money offer was recently made by Shanghai SIPG of the Chinese Super League to sign him yet the 26-year-old turned it down.
His refusal to leave United, much like how Bastian Schweinsteiger is holding firm, is a problem for Mourinho given he wants to sign another new centre-back.
Until the former Chelsea boss sells Rojo - and Phil Jones, who is also surplus to requirements - he will be unable to generate the funds needed to make a defensive addition, let alone free up a squad place.
You can hardly blame Rojo for wanting to stay put, though, after a stolen pay slip revealed he earns somewhere in the region of - wait for it - £200,000-per-week at Old Trafford.