The only confusing thing with Nielsen is that he's featured in the Membership brochure. Mullaney is missing from it, suggesting they knew he wasn't coming back. But if they also knew Nielsen wasn't returning, why put him in there?
All a bit annoying players not honouring commitments, but I suppose that goes both ways when the club got shut of Siejka on account of him being crap (well, that's not the reason they gave, but I'm sure it was accurate...).
Suppose we'll find out when we see who actually turns out in the games. Until then, anyone could be leaving.