Since the day after the 2009 season when the Lions signed Jonathan Hefney, the effort has been continual to upgrade the roster.

Martin Mayhew has trashed the 2009 defense. The only defensive back from 2009 still on the roster is Louis Delmas. That includes backups. .

The defensive line has been made over and there’s a new starting linebacker in Zack Follett.

At the same time, he’s added value to the offense with Jahvid Best, Nate Burleson, Tony Scheffler and Rob Sims

Mayhew had a great answer when asked what more the Lions need: “Wins, to win some games, to win more than anything else. Our guys have to start playing together, trusting each other and learning how to win football games.’

It’s pretty simple. Mayhew has done his part -- although don’t believe for a second that this 53-man roster is set in stone. Now he needs the players to step up starting on Sunday with the opener in Chicago.

This Lions team just vaguely resembles the team that lost twice to the Bears last season. However, thanks mostly to injuries, they haven’t practiced all that much together, especially on the linebackers and the defensive backs. The offense has been revamped too, but they have been healthier throughout training camp and the offseason.

“We expect to be very competitive in every game, every time we line up we expect to compete and match up which has been a problem in the past,’’ Mayhew said.

The Lions ,6-point underdogs, could make a huge statement with a win at Soldier Field. Also, they could start developing a confidence that comes from playing together and winning.

(Follow me on Twitter @paulapasche.)