Quay Walker has apologised for shoving a member of the Detroit Lions' training staff in the Green Bay Packers' season-ending loss on Sunday.

Needing only to win to reach the playoffs, the Packers suffered a surprise 20-16 defeat to the Lions at Lambeau Field.

Walker was disqualified on the Lions' go-ahead scoring drive in the fourth quarter after pushing a trainer as he attempted to tend to Detroit running back D'Andre Swift.

Former Packers running back Jamaal Williams scored his second rushing touchdown three plays later to put the Lions up for good, with Aaron Rodgers then intercepted on the next drive, allowing Detroit to kill the clock and Green Bay's hopes of an unlikely Super Bowl run.

Walker's show of ill-discipline was not his first of his rookie year, the first-round pick having also pushed a member of the Buffalo Bills' practice squad on the sideline after a play in the Packers' Week 8 loss.

In a post on Twitter, Walker wrote: "I want to apologise publicly about what happened Sunday night. I reacted off of my emotions again and take full responsibility of making another stupid decision.

"Since then I've questioned myself on why did I do what I did when the trainer was doing his job!! I was wrong!!

"I understand I have to face everything that comes with the decision I've made and I'm definitely paying for it now.

"Also to explain my frustration in the tunnel. I wasn't upset about being kicked out, I just knew I messed up again and was wrong for what I did and couldn't believe I did it again.

"To the Detroit Lions and to the entire training staff including the person I did that to. I'm sorry."