Marseille's dramatic Coupe de France victory over Lyon in midweek was just the fillip they would have been looking for ahead of Sunday's crunch meeting at home to Paris St Germain in the 'derby of France'.
OM scored two goals in the last five minutes to beat Les Gones 2-1 and qualify for the quarter-finals of the competition.
It is back to league matters now for Albert Emon's team, who slipped to fourth in the standings with a 2-0 defeat to Le Mans last weekend.
Games do not come much bigger than OM against PSG, and there is usually as much coverage of proceedings off the pitch as there is on it.
The match is arguably more important to the visitors, who could slip into the relegation zone with even a draw at the Stade Velodrome.
PSG are joint-fourth from bottom in the table, and only one point ahead of Nantes, who currently occupy the final relegation place.
New coach Paul Le Guen has been unable to muster a victory in his three league games in charge of the capital club, and their winless run now stretches to a worrying 11 games.
Nantes, meanwhile, play second-placed Lille on Saturday, just days after beating Claude Puel's side in the Coupe de France thanks to a last-minute goal.
Les Dogues will be seeking to avenge that defeat, and attempt to pile the pressure on Lyon a day before the champions play Troyes.
Gerard Houllier's men were going through a bad patch even before their midweek cup defeat, having gained just two points from their last four league games.
They still, however, hold a 13-point cushion at the summit, as a host of teams - including Lille - squabble to be their dauphin.
And they will be desperate to end their barren streak at the start of a month that sees them resume Champions League duties.
They will find it tough at Troyes, who are level on 21 points with PSG, but have lost only once in eight Ligue 1 games.
Third-placed Lens, a point and a position below northern neighbours Lille, came back from a three-goal deficit to draw against St Etienne last Sunday.
And they will need to show similar spirit at Valenciennes, who are defending a strong home record.
Elsewhere, fifth-placed St Etienne host cellar-dwellers Sedan, sixth-placed Sochaux welcome Rennes and second-bottom Nice entertain seventh-placed Bordeaux.
Nancy play Toulouse, Le Mans visit Lorient and Monaco host Auxerre.