Lambert takes Aston Villa to Carrow Road on Saturday.
It's dog eat dog in this business and sometimes you've got to look after yourself," said Howson.
"It's another game of football and nothing is going to be decided on that game. There are still points to play for after it.
"I think when you are at this stage of the season, you just prepare and go into every game like you would whatever stage of the season it is. And if you give it your best shot and you succeed, then great - and if not, at least you can say we've done everything right.
"I don't think it makes a difference to the atmosphere if Paul Lambert is coming back or not. The Reading game the other week was great and there was no ex-manager coming back then. So if we can come out of the blocks early like we did against Reading, get the crowd on the edge of their seats, I'm sure it'll be an entertaining game."