But Andy, called up for the latest Wales squad, admits that the performance against his old club Sunderland needs to be improved upon.
"I wouldn't say it is out of our reach but we can't come up with another display like Saturday, it is as simple as that," he says.
"It was not acceptable, but it has been good since I have been at the club and hopefully Saturday was just a blip - and we can play well to the end of the season.
"Millwall are on a run and going well, but Norwich lost at the weekend which was a result for us, and I think it is going to be really tight with the top eight.
"It is a big game, a London derby, but every game until the end of the season is massive, especially when a team is facing West Ham - a big club that everyone wants to beat."