Luke Shaw's double leg break back in September left Manchester United with a huge hole to fill in the left-back spot. The England international had been the Red Devils' star performer before his season was cut short in Eindhoven.
Since that game against PSV Eindhoven, Louis van Gaal has deployed three different players in the full-back spot as he looked for his solution to Shaw's injury.
Marcos Rojo, Ashley Young and Matteo Darmian were all given a chance to shine as the Dutch boss attempted to find his go-to back line.
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Rojo originally struggled when handed the chance to stake his claim against Southampton. The Argentine international was given a tough time by Sadio Mane and struggled with a hamstring injury.
Having missed a further month due to the issue, Rojo returned to the starting line-up against Everton and has produced two top-class performances.
His display at Goodison Park was of the highest order. He nullified the threat Aaron Lennon and produced a pinpoint cross to assist Ander Herrera.
The 25-year-old did not fare so well against CSKA Moscow, though, as he was dragged off 64 minutes. But his showing in the 0-0 with Manchester City show a player who is finding his best form at Old Trafford.
He dealt well with Kevin de Bruyne in the first half before the Belgian switched flanks with Jesus Navas. However, the Spaniard could not fare any better.
The former Sporting Lisbon made 22 league appearances for the Red Devils last season - whether that be at left-back or central defence - but was unable to hold down a regular spot.
Injuries have hampered his progress; a dislocated shoulder, thigh problems, groin issues and a hamstring strain have plagued the defender since his £16 million move last summer.
Phil Jones and Chris Smalling look to be developing a strong partnership in the middle so Rojo's best hopes of playing may be down the left.
With Shaw out until at least April, the 37-cap international has a chance to nail down his spot in the starting XI.
If he can continue to produce performances like he did against Manchester City, then Shaw may find it difficult to work his way back into the side when he returns.
Is Marcos Rojo producing his best form for Manchester United right now? Have your say in the comments below