Well Slater will stay as he isn't included in the cap. Whilst there's been media around Crowley, it's not a surprise to anyone that he's available. Karanka has been saying all January that he needs to go and today he said he'd removed him from their squad list. Crowley was linked with Coventry, but they went for Matty James instead, which is surprising considering Dan's from Coventry.
Crowley's not a luxury AM type either, I'm pretty sure he can play all 3 midfield positions, I'm sure I've seen him play as a deeper midfield and just progress the ball. He is pretty versatile, a little bit of a combo between Doc and Honeyman, he's a good dribbler like Doc but a better passer. Good from set pieces too. He doesn't have the engine either Doc or Honeyman have though
Re the striker we all know we need one but there's no point spending £200k-500k for him to be no better than what we have. Magennis has got 7 goals so far and we're only at the half way stage, considering he's not a natural goalscorer that's pretty good going, expecting him to get between 12-15. He's been very good so far so whoever comes in needs to be better especially as come the summer (& hopefully promotion), city fans will once again be asking for another goalscorer