Campese said the playing squad has to take some responsibility for the current situation.
“We have to take responsiblity as a group of guys,” he told the BBC.
“Go out there and play football like we’re paid to do. I think a few of the boys let him down and that’s the reason why I guess he’s lost his job.
“We did talk about that last week, a bit of responsibility falls back on us and I’m sure that the response is going to be even better this week.”
Hull KR travel to Widnes this Friday to take on the in-form Vikings.
Campese said he is unsure of what will happen with the club’s head coaching position.
“I’m not sure, I’m not sure what’s going on at the moment,” he said.
“We’ve just to knuckle down and train hard and prepare for these football games. Hopefully that, sooner rather than later.
“Willie’s in there at the moment and I’m not sure what the plans are for the rest of the year if he’s going to stay on or they’ll bring someone else in for the rest of the year, and bring someone else in after that.
“We can only do one thing and that’s prepare and play against Widnes because if we worry too much about what’s going on behind the scenes then they’ll do a job on us on Friday.”
Campese is recovering from injury but said he is expecting to be back for either Huddersfield on March 13, or against Salford on Match 20, if everything goes to plan.
“I’m chomping at the bit,” he said.