Manchester United have opened an internal investigation after sensitive tactical details were leaked ahead of their extraordinary 4-4 Premier League draw with Bournemouth, raising fresh questions about security and trust behind the scenes at Old Trafford.

Since arriving at the club in November 2024, head coach Ruben Amorim has largely stuck to his preferred three-man defence — a system that has drawn both scrutiny and criticism, with some accusing the Portuguese coach of tactical rigidity. However, for the clash with Bournemouth, Amorim opted for a notable adjustment, deploying Diogo Dalot as a more traditional full-back in a back four.

Remarkably, reports outlining this exact tactical tweak surfaced just hours before kick-off at Old Trafford. The timing of the information triggered alarm within the club, particularly given the strategic importance of the change and the chaotic nature of the match that followed.

According to the Daily Mail, Manchester United have now launched a formal internal probe to identify the source of the leak. Club officials are said to be keen to establish whether the information came from within the coaching staff, the playing group, or elsewhere inside the organisation.

Concerns over internal leaks are nothing new at United. Similar issues were reported during the tenure of Jose Mourinho, highlighting a long-standing problem that has resurfaced once again during a turbulent period for the club.