Ralf Rangnick, the former manager of RB Leipzig and Red Bull Salzburg, was appointed as the interim manager of Manchester United in December 2021. The appointment marked a significant shift in the club's tactical approach, with Rangnick implementing a new system that he believes will turn the tide for Manchester United.

Under Rangnick's leadership, Manchester United has made some significant changes to their playing style. One of the most notable changes is the introduction of a more attacking approach to football. This means that Manchester United will be looking to play at a faster tempo, creating more chances for their attackers to score goals.

Another key aspect of Rangnick's tactical approach is his emphasis on defensive solidity. He wants Manchester United to be able to defend well against opponents who are pushing forward, which means that they will need to work hard defensively and maintain a high defensive line.

In addition to these changes, Rangnick has also implemented a number of changes to the squad. He has brought in a number of new players to strengthen certain areas of the team, while also making some changes to the existing squad to bring in fresh ideas.

Overall, Rangnick's appointment as Manchester United's interim manager marks a significant shift in the club's tactical approach. Under his leadership, Manchester United is set to make some big changes to their playing style and will be looking to turn the tide on their current struggles.