Manchester United defender Chris Smalling will reportedly miss the next month of action with a hamstring injury.

The England international suffered the blow before Sunday's 3-0 defeat to Liverpool, and the problem will see him miss four weeks of football, according to The Mirror.

Smalling will play no part in Wednesday's Champions League tie with Olympiacos, while the former Fulham youngster will also miss the upcoming games against West Ham United, Manchester City and Aston Villa.

With Nemanja Vidic suspended for the game against the Hammers on Saturday, manager David Moyes is expected to pair Phil Jones with Rio Ferdinand.