March 20 (Reuters) - Manchester ⁠United manager Michael Carrick says Matthijs ⁠de Ligt’s recovery from a back ‌injury is progressing slower than expected and he has no idea when the Dutch defender will be ​able to return to action.

De ⁠Ligt, 26, has ⁠been sidelined since United's 2-1 win over ⁠Crystal Palace ‌in November and there are doubts he will be fit ⁠for the World Cup, which starts on ​June ‌11 in North America.