The duo have been paired together on a number of occasions across the course of the season.
"Since Marcos has come he's played the right way and in the way we've wanted to play," Jones told MUTV. "It's difficult to come over to a different country and a different league and go straight into the team and hit your form, but he's done well."
As for the competition for places, Jones added: "We're at Manchester United so you wouldn't expect anything else in that sense. Whatever team the manager picks we all have to go out there and produce. I'm enjoying playing but I don't think anyone is guaranteed to start. It's about taking things a game at a time and evaluating your individual performances at the end of the match."
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