Shamrock Rovers sit bottom of Group F with one point, while United and Arsenal prepare for Europa League action.
Shamrock Rovers bid for their first win in Group F of the Europa Conference League tonight.
Stephen Bradley's side take on Gent at Tallaght Stadium from 8pm.
Ronan Finn and Gary O'Neill are out due to injury, while Graham Burke and Jack Byrne are doubts.
Elsewhere, in Group B, leaders West Ham take on Silkeborg, while Hearts face RFS in Group A.
Erik Ten Hag says Cristiano Ronaldo will be involved in tonight's Europa League meeting with Sheriff.
United go into their Group E clash in second place in the table.
Ronaldo was dropped for the Premier League game against Chelsea, after refusing to come on as a substitute versus Tottenham.
But ten Hag says the situation is now resolved.
Kick off is at 8pm at Old Trafford.
In Group A, Arsenal face PSV from 5.45 with top spot already secured.
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