Mullen signed with Linkoping of the Swedish Hockey League on Monday.
Mullen was claimed off waivers by AHL Rochester on Wednesday.
Patrick Mullen has signed a one-year, two-way deal with the Ottawa Senators.
Mullen can earn $700,000 at the NHL level. He had eight goals and 32 points in 66 AHL games in 2013-14.
The Vancouver Canucks have shipped Patrick Mullen to Ottawa in exchange for Jeff Costello.
Mullen, 27, has seven goals and 20 points in 46 games with the Utica Comets this season. He hasn't made his NHL debut yet.
Patrick Mullen suffered an undisclosed injury Wednesday and did not return.
Just an FYI. He has no fantasy value.