Greenwood has been outstanding for OM since joining last summer from Manchester United.
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This season, the forward has produced career best form, putting behind him past dropped charges of assault in England.
"When I speak about Mason it's a special feeling because it's very rare in a lifetime that you get to share the pitch with such an amazing player and amazing character," Weah told The Sun.
"We've grown closer since I've joined the team and been here. Hopefully he gets that call-up soon. I'm super proud of him.
"He's having an amazing season and hopefully I can help him to reach those heights that he's aiming for."