MacEwan was placed on waivers by the Senators on Sunday.
MacEwan was removed from injured reserve and will play Sunday against Washington, Bruce Garrioch of the Ottawa Sun reports.
MacEwen (lower body) was placed on injured reserve Tuesday, per the NHL media site.
MacEwen was recalled from AHL Belleville on Friday.
MacEwen was placed on waivers Monday, per Chris Johnston of The Athletic.
MacEwen (illness) will be a game-time decision Saturday in Edmonton, according to TSN 1200 Ottawa.
MacEwen will not be in action versus Seattle on Thursday due to an illness, TSN 1200 Ottawa reports.
MacEwen scored the game-winning goal in Sunday's 5-1 win over the Sabres.
MacEwen was called up from AHL Belleville on Saturday.
MacEwen was put on waivers by Ottawa on Thursday, according to Stephen Whyno of the Associated Press.