There has been a change of fortunes at Manchester United after Ole Gunnar Solskjaer's arrival, replacing Jose Mourinho as the club's manager back in December. While the club have boosted their chances of earning a top-four spot in the Premier League, they completed the unthinkable in midweek - progressing into the quarter-finals after beating PSG in the last-16.
Almost every United player is back in form including the likes of Paul Pogba, Marcus Rashford and Romelu Lukaku who have all enjoyed impressive displays under the Norwegian's guidance. As seen over the past few weeks, a few team weaknesses have been identified, something which Solskjaer needs to pay attention to in the business end of the campaign.
A few first-team departures are expected at the end of this season and based on individual performances over the past few months, the club may be forced into making some difficult decisions with regards to a few departures. However, here are three players they should not make the mistake of selling this summer:
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#3 Marcos Rojo
Marcos Rojo has hardly been involved in any football this season as the Argentine has remained on the sidelines due to a knee injury. Although he recently made his return to the senior squad, he's yet to start a game for the Red Devils since his injury lay-off.
With United in search of additional defensive reinforcements, Rojo has been rumoured to be making way for potential new signings this summer according to various media reports. However, it should be noted that the 28-year-old is a solid defender, but one who just hasn't settled well to life at Old Trafford.
That may seem strange to say, considering he's been at the club since the summer of 2014, but it's the case. A genuine left-back with the versatility to play at centre-back too, the Argentine is excellent on the left-hand side and his creative tendencies are underrated too.
Although rash and a tough-tackler, Rojo could be a player rejuvenated - just like Victor Lindelof - under Solskjaer's watch. With all of that in mind, United should focus on keeping Rojo fit, rather than trying to sell him for at least twelve further months.
#2 Ashley Young
Following Antonio Valencia's injury struggles, Ashley Young has taken on the mantle of being Manchester United captain with high esteem and the versatile Englishman has regularly featured at right-back across recent seasons - looking comfortable in his newfound role.
At 33 and not being a natural fullback, the likelihood is that United will let Young depart this summer. However with Valencia set to leave once this season is complete, it might not be a good decision to offload two experienced defenders in the upcoming transfer window - regardless of who is recruited.
Summer signing Diogo Dalot is only 19 and despite his promise, may take a few more seasons to become a seasoned campaigner. Young's position in the first-team could prove vital for United going forward, especially with the number of games in different competitions on offer.
#1 Romelu Lukaku
Until a few weeks ago, Romelu Lukaku was struggling to find his feet with United this season. The Belgian had seen his first-choice role in attack relinquished, with Marcus Rashford flourishing - while failing to score regularly nor impress when called upon.
According to the Daily Mail, he was rumoured to be involved in a potential swap deal with Inter Milan's Mauro Icardi at the season's end. Inter - among others - are interested in signing him if he's made available and despite his quality, the odds were high that he'd be considering his options at the very least had things not improved.
However, they have done so. With three consecutive two-goal performances from the 25-year-old, the tide seems to have turned. He's gradually warming to the supporters and slowly justifying his £75m price-tag from Everton two summers ago.
With a few troublesome injuries and post-World Cup hangover which affected him, it's clear that he's capable of some excellent individual displays and United must be more patient with him going forward.