Manchester United forward Marcus Rashford was dropped to the bench for Saturday's Premier League game at Wolves for disciplinary reasons.
Asked about Rashford's absence, manager Erik ten Hag told BT Sport: "Internal disciplinary. No [details]. Our rules."
England international Rashford started United's previous game against Nottingham Forest on 27 December, scoring the opening goal in a 3-0 win.
He was replaced in the starting XI by 18-year-old winger Alejandro Garnacho.
Rashford came on as a half-time substitute for Garnacho at Molineux.