A narrow defeat to Salford Red Devils in the Million Pound Game saw the Humberside outfit condemned to life in the Championship for next season.
Despite their relegation, the club have managed to keep hold of some key personnel, with Shaun Lunt, Chris Clarkson and Matty Marsh just a few to commit.
McNamara, who suffered relegation during his time with Huddersfield as a player, is confident the Robins will make a swift return to the top flight.
He told the Hull Daily Mail: "It's interesting that Rovers have been very active since relegation. Re-signing someone like Shaun Lunt is huge and that's a really good statement.
"Staying full-time was vital to the stability at Huddersfield as well. It's important to keep as many of the really influential players in the team on board and get the balance of the rest of the squad right as well.
"Getting relegated gives a real clear focus going into pre-season. All they want to achieve now is promotion. It's going to be a real test but they are as strong as any team in that position hoping to come back up."