Lee, a former second-round selection out of Auburn, joined the Raiders during the offseason and started seven games in replace of injured cornerback Ron Bartell, who broke his shoulder blade during the season opener.
Bartell was placed on Injured Reserve after the injury and was eligible to return last week. The Raiders decided to release Lee to make room. Bartell returned to the starting lineup for the Raiders, just in time for their 55-20 loss to the Baltimore Ravens.
Lee said he was "kind of, sort of" surprised to be released but understood that the NFL is a "business".
"I felt like I did pretty well. I made some plays. Just in a tough situation, a starter came back," said Lee.
The Lions decided to pounce on Lee when he became available, coveting his diverse skill set and size.
"Pat has good experience in the League," said head coach Jim Schwartz. "He's got good size. He's another guy that's got some multi-dimension stuff, and it's very rare that those guys become available. When he did become available and he had starting experience at Oakland this year. So a little bit like we talked about with Drayton (Florence), get a veteran guy and guy that's good size, got some flexibility, has also been a very good special teams contributor.
"I think that was a good get for us, particularly at this point of the year. What his role is remains to be seen. We'll see how he progresses this week and what makes best sense for Sunday if anything."
Lee offers experience to a beat up secondary, special team flexibility and offers a good presence in the locker room. He was originally drafted by the Green Bay Packers, spending three years there, so he is familiar with this week's opponent and they are with him.
"Pat's a high energy guy, a high effort guy," said Packers quarterback Aaron Rodgers. "He made a couple big plays for us on special teams during his time here. I think he's a guy who can play inside and outside corner and he's always around the football. So, I enjoyed our time here with Pat. He's a good teammate and a good pro. He's on time, he's prepared and he understands what it means to be a good teammate."
During his three seasons in Green Bay, Lee wasn't a regular starter. This resulted in the 28-year-old spending a lot of time on the scout team, matching up directly against Rodgers and the Packers offense.
He is now provided the unique opportunity of going from scout team defense to opponent team defense.
"It feels great, going against them ole boys," said Lee. "Instead of scout team, it's going to be a real game, so it should be fun."
Lee isn't a lock to play this weekend but, whether or not he is on the field, he will have some contributions for his new teammates.
Lee May have more insight to Rodgers and the Packers offense than anyone else in the locker room and he is happy to volunteer the information to his fellow defenders.
"I'll be talking to these guys," Lee said with a smirk. "Yeah, I'll be talking to these guys."