Manchester United are about to discover if Rangnick has solved Solskjaer's biggest problem

It is really tricky to judge just how well Ralf Rangnick has done since he took over as Manchester United interim manager at the back end of November.

In terms of cold hard stats, United have lost once in 90 minutes under the German, with another defeat on penalties to Middlesbrough in the FA Cup. They have scored 19 goals, conceded 10 and kept five clean sheets from 14 games and they're fourth in the Premier League table.

Their hopes of silverware now solely rely on an unlikely Champions League success, and Rangnick has himself admitted that the best possible outcome this season would be to finish fourth.

United have entered damage limitation mode in a season in which they should have been genuinely challenging for the title, with the conservative approach also evident in their on-field performances.

Anyone who has watched United in recent weeks will be well aware of the many issues that have plagued the side and the unavoidable fact that many of their wins have come in rather fortuitous circumstances.

United were lucky to beat Norwich away, scored late on to somehow beat West Ham and even on Tuesday night, were second-best for large parts of the match against Brighton.

On plenty of occasions their luck has run out. Despite dominating spells, United paid the price for profligacy in front of goal in a string of draws against Boro, Burnley and Southampton and know that similar performances in the weeks ahead will only see them drop even more points.

This weekend's trip to face Leeds will mark the 12th time Rangnick has taken charge of United in the Premier League, a landmark which means he will have overseen just as many matches in the competition this season as his predecessor, Ole Gunnar Solskjaer, did before he was