Ralf Rangnick's tenure as Manchester United interim manager has not been a resounding success.
While United have climbed from seventh in the Premier League when Ole Gunnar Solskjaer was sacked to fifth, closing the gap to the top four from six points to one, fourth-placed Arsenal have three games in hand and should expect to qualify for the Champions League.
United's hopes of returning to Europe's elite club competition next year – by which time Rangnick will likely have moved upstairs – might instead rest on success in this year's tournament.
Atletico Madrid visit Old Trafford on Wednesday with their last-16 tie level at 1-1, apparently finely balanced – although the first leg was anything but. United were hugely fortunate to escape with a draw after lacking any real fluency in Spain.
Real Madrid great Cristiano Ronaldo will still no doubt be eagerly anticipating this match following his Tottenham hat-trick, but repeating those heroics represents a tall order. He will need help – and the manager's job is to provide that.
Although Rangnick has so far failed to deliver a coherent side able to produce consistent performances, that is not to say there have not been success stories of his reign.
And perhaps Jadon Sancho, who is definitely one of those, can be the man to lift United and their talisman this week.
Sancho is now finding form after a tough start to life at Old Trafford that was somewhat overshadowed by the various other issues United have faced this season, both before and since Solskjaer's sacking.
At another club, Sancho's struggles would have been front and centre, as he remarkably failed to contribute either a goal or an assist in 14 appearances for Solskjaer in all competitions.
That was certainly not what United envisaged when they paid £73million for an England winger whose 107 goal involvements (50 goals, 57 assists) for Borussia Dortmund arrived every 93 minutes on average.
There would have been relief then when Sancho was the star of Michael Carrick's short stint as caretaker, following his first United goal at Villarreal with a second at Chelsea.
Yet more than two months passed before Sancho scored again, kickstarting a vastly improved spell under Rangnick – a coach belatedly having the transformative effect on the 21-year-old many had forecast.
Rangnick's preference for a pressing game was expected to suit Sancho, whose Dortmund in the Bundesliga last season allowed the fifth-fewest opposition passes per defensive action (PPDA – 11.0) and won the fourth-most high turnovers (329).
Under Solskjaer, United ranked a passive 14th in PPDA (14.4), yet that statistic has not altered as drastically as one might have imagined; since Rangnick's appointment, United are 12th (13.3).
Others who have flourished under Rangnick have still done so by leading the press – Fred (51.8) and Anthony Elanga (51.2) rank first and second for Premier League pressures per 90 by United players since the interim boss came in – whereas the speed of United's attacking once they win possession has suited Sancho.
Opta defines a direct attack as "an open play sequence that starts just inside the team's own half and has at least 50 per cent of movement towards the opposition's goal, and ends in a shot or a touch in the opposition box".
Since the start of February, United have scored four league goals from such attacks – twice as many as any other side. Sancho has been involved in all four, striking on the break against both Southampton and Manchester City while laying on assists for Bruno Fernandes and Fred at Leeds United.
The goal at City may have counted for little on a dark day for United, but Sancho has been flying since scoring on his return to the team against Middlesbrough in the FA Cup on February 4, having been granted a period of leave following a death in his family.
"Jadon Sancho is now getting closer to the Jadon Sancho I've known from Germany," Rangnick said at the weekend. "In the end it's all about confidence. Game time, confidence. Confidence, game time. He was performing at a very high level."
He added: "This is what he should be. The club paid quite a few pounds for him in order to lure him away from Borussia Dortmund, and if you pay that amount of money in a transfer fee for a player, he should perform on this kind of level."
Rangnick was speaking after the win against Tottenham, where there was finally a goal courtesy of his combination play with Ronaldo.
It was suggested earlier in the season the pair could not work together – and the woes of both Sancho and United might agree with that argument – but the rapid run in behind and pinpoint square pass for the second of Ronaldo's three goals were evidence of how this attack can succeed.
Ronaldo can continue to thrive with that sort of service, while Sancho only looks better for having a focal point to play off in the mould of former Dortmund team-mate Erling Haaland.
Now, with 13 goals in his past 15 home games against Atletico, including two hat-tricks in the last four, do not bet against Ronaldo proving the difference again on Tuesday. Also, do not bet against Sancho being the man to supply him.