The Germany international's future now is up in the air and El Mundo Deportivo says United and Barcelona are circling.
Both European giants have asked Reus' camp to be kept informed of developments over the coming weeks.
Moving on from BVB has not been ruled out by Reus' agent.
"Marco would make any big European team stronger," Dirk Hebel said earlier this week.
"That's why it's completely normal that a number of these major European teams are interested in signing him."
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