The Seattle Seahawks are looking to upgrade their pass rush.
"A deal could happen soon," added Silver.
Matthews racked up eight sacks and 37 total tackles in 13 games for the Los Angeles Rams in 2019. But L.A. released the former Green Bay Packers star after one year with the team.
Meanwhile, Griffen opted out of his contract with the Minnesota Vikings despite it having three years remaining. Vikings head coach Mike Zimmer said in February that he expects Griffen to return, but the pass-rusher remains on the open market nearly six months later.
Griffen had eight sacks and 41 total tackles last year.
The Seahawks are in desperate need of more pass-rushers. The team's 28 sacks tied for the second-fewest in the league last season.