Marseille Front Office
Balotelli hasn't played since early December after falling out with Patrick Vieira.
Kevin Strootman made 130 appearances for Roma, scoring 13 goals.
Antoine Griezmann scored in the 21st and 49th minutes while Gabi scored in the 89th minute.
The competition is Arsenal's only realistic opportunity to qualify for the Champions League.
Arsenal have drawn AC Milan in the last-16 round of the Europa League while Atletico Madrid will play Lokomotiv Moscow.