I agree Josh, Rosler going now wouldn't be on Cellino's agenda, but he'd be hovering around the off switch, I sense Cellino's patience is waning, and his frustrations waxing though.
JFH, to many he would be a umming and arring situation in that he'd be coming up from L1/L2 to a league that's hard to get out of, well worth the short list as a minimum.
We had BM, who got Reading promoted but fizzled out at Leeds, We had Hockaday who got the players fit but the results weren't forth coming, although I felt his departure was a bit premature, Milanic, who had success with a few Euro teams but kept picking the team to draw, Redders from our Academy, played favourites, couldn't see in front of his nose and kept picking a none attacking team, we now have Rosler who's had success in past but was out of work when Cellino gave him a chance. He too seems to be picking a none attacking team with the aim not to lose rather than too win, I also think he's playing favourites with a few players.
It would seem, while we are a team in championship, we're a damn hard team to manage/coach, or we're picking wrong coaches, which can happen at any club.
Because of his recent successes with Burton I'd put him on short list, I'd add Gary Mac too who I believe has recently become available and, while some will disagree, I'd add Steve Evans to the list because of his back to back successes with Rotherham, but, before some say he couldn't cut it in championship, he would have better players than he did at Rotherham.
Milanic is still on gardening leave I believe, but he's not available due to getting ready for the next Chelsea Flower show.