Another roster move?

From Gregg Drinnan's Taking Note:

The Pats have assigned F Michael Sagen, 17, to the Melville Millionaires. Sagen, who has one goal in 17 games, will spend this week with Regina and then join the Millionaires
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He still appears on the Pats roster (like it says "for the rest of the week").... Mr. Drinnan is usually right on with any sort of roster move. I would assume that they are waiting for Nils Moser to get healthy before the transaction occurs.