The Ireland prop heads back there tonight having left in 2015 to sign at Headingley on a three-year deal.
He has not always found it easy to cement a place in Brian McDermott’s side but the Leeds coach said his try-scoring performance in the win against Wakefield last week was his best yet for Rhinos.
Mullally, 25, said: “I feel comfortable now. Not comfortable as in complacent, but in how I am playing and the environment I am in.
“I am enjoying it more and that’s helping me improve. I am trying to build some consistency in my game. That’s where I am at at the moment, just focusing on the areas I need to work on.
“It is no good one week scoring tries and people saying you’ve played well, then you let it get to your head and the next week you have a bad game.
“For me it is important to stay focused and just do what I do –train hard, keep my head down and just focus on getting picked.
“That’s what I want to do before I think of anything else.”
He has played in five of Leeds’ six matches so far and with Keith Galloway still injured and fellow prop Brad Singleton just one game into a six-match ban, he has chance to further make his mark.
He added: “We were just a point off top after winning last week. If we do a job at Huddersfield I think we will make a bit of a statement.
“Everyone’s talking about other teams. I think we are quite happy with that going under the radar.”
Meanwhile, Leeds will welcome Doncaster to Headingley Carnegie for the Ladbrokes Challenge Cup fifth round tie on Friday April 21, kick-off 8pm.