His chances of starting were zapped by a stinger early in camp, and his season ended with a neck injury sustained during a December practice.
On Monday, Thompson was released and said he would retire.
"I have consulted with a number of physicians, and due to my medical condition my intention is to retire from football," Thompson said in a statement released by the Packers. "I am thankful to the Packers organization and to the fans for their support during my time in Green Bay. The Packers are a first-class organization and I want to thank them for the opportunity to play in the NFL. There truly is no team I would have rather played for."
A fourth-round pick in 2008, he started three games as a rookie and played 15 games in all, posting 15 tackles.
Another roster move
With fifth-round pick Andrew Quarless added to the mix, the Packers released tight end Devin Frischknecht and re-signed a familiar face, safety Charlie Peprah. Frischknecht broke a leg during training camp last summer. Peprah played in 37 games for the Packers from 2006 through 2008. He was released at the end of training camp last summer and played in two games for Atlanta.
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Bill Huber is publisher of Packer Report magazine and PackerReport.com and has written for Packer Report since 1997. E-mail him at firstname.lastname@example.org, or leave him a question in Packer Report's subscribers-only Packers Pro Club forum. Find Bill on Twitter at twitter.com/packerreport and Facebook under Bill Huber.