Suh is entering the final season of his rookie contract, which he signed after the Lions picked him No. 2 in the 2010 NFL draft.
The Nebraska product has a cap hit of $22.4 million this season. Should the two sides not agree to a deal, the Lions would have a choice of signing Suh to a $26.7 million tender in 2015 or letting him become a free agent.
GALLERY: SUH'S CONTROVERSIAL MOMENTS
Earlier in the offseason, the Lions said they were optimistic about getting a deal done. Suh has said he wants to stay in Detroit.
Suh, 27, has 135 tackles and 27.5 sacks in his four-year career. He was named First Team All-Pro in 2010 and 2013.
- Ben Estes