Despite the thrilling 2-2 draw, the Red Devils once again exhibited signs for concern against Atalanta.

Manchester United dominated the headlines after Tuesday's round of UEFA Champions League fixtures, with Cristiano Ronaldo's exquisite equalizer in the final minutes of their clash with Atalanta garnering the Portuguese icon plaudits.

The Red Devils twice went a goal down, but the five-time Ballon d'Or winner twice came to his club's rescue, scoring a brace to make it four points across the two legs against the Serie A side.

Both Rio Ferdinand and Eni Aluko, who were on pundit duty at BT Sport for this clash, were brought to their feet after witnessing Cristiano's heroics. However, for the second time running, the Red Devils showed signs of worry against Atalanta.

The injury to Varane, the move away from the three-at-the-back system that worked effectively against Spurs, and the poor defending – and goalkeeping for the opening goal – were all signs for concern at the Stadio di Bergamo.

Given that their next game is the Manchester Derby, Solskjaer's men will need to improve drastically if they wish to avoid a similar beating to the one they suffered at home to Liverpool. This was something Luke Shaw hinted at after the game, with the Englishman honestly admitting that they are still way off where they need to be despite coming back from a goal down twice.

"We have to keep this attitude. Just because we beat Spurs 3-0 and we picked up a point here, we can't put our heads down, we can't get comfortable. 

"We can't think, 'Ah, look, we've done it now, we've got out of our rut and everything's perfect, everything's fine'. It's not. We know we need to dig deep. We know we're not in a good situation, we know what we've been doing hasn't been good enough.

"As a team we've talked about that inside the dressing room, so the games didn't come any easier, so we need to be ready for this one because it's at home and it's a big game."

Shaw went on to add: "If you look at the group [United are top], it was an important point. Of course it's not what we wanted. We wanted three points. 

"You have to look at the way the game went and the score towards the end, I think you would take a point in this situation. But of course we know we've still got a lot to improve on. 

"You know the results the last couple of games have been a bit better, but we've still got work to do and we're in charge of our own group now."

The game against Man City this weekend will be the ultimate test. While the 3-0 win over Tottenham was needed, that result did little in convincing Solskjaer's critics that he is worthy of the Old Trafford job. Should he beat the defending Premier League champions, then the Norwegian might start winning back a few of his detractors.