ASM were beaten 1-0 after Greenwood struck inside the final ten minutes at the Velodrome.
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The former Manchester United told Ligue Une+ afterwards: "It was incredible, to be honest. It's fantastic to get the three points.
"It's great, everyone on the team worked well. It's a team effort."
Marseille goalkeeper Geronimo Rulli also said: "It was a very tough match between two teams that played in the Champions League this week. I think it was a great game to watch. Lots of chances on both sides.
"Today we had a bit of luck with those two goals disallowed. It was a special and difficult match."