The former Texas A&M standout QB is visiting with the Raiders on Sunday and Monday, FOX Sports 1 NFL Insider Mike Garafolo and other media report. The Raiders will select fifth in the draft.
Manziel visited the New England Patriots on Wednesday.
Manziel is arguably the most polarizing quarterback in this year's draft class. After becoming the first freshman to win the Heisman Trophy, Manziel followed it up with a stellar sophomore season, including several headlines off the field.
The Raiders finished 4-12 last season and never had an exclusive No. 1 at QB as Terrelle Pryor and Matt McGloin shared time.