Manchester United medics are baffled by Michael Carrick's health problems.

Carrick has been sidelined since feeling dizzy after his last match almost six weeks ago.

United's medical chief Steve McNally tried to get to the bottom of the problem following Carrick's appearance against Burton — his only match of the season.

It is not known when Carrick will return to first-team action, says The Sun.

United boss Jose Mourinho insisted the ex-Tottenham midfielder had a big role to play this season but has been frustrated that he has only featured for 90 minutes against Burton.