Manziel flew to Oakland on Sunday morning following his appearance Saturday night at the NCAA basketball tournament Final Four games in Arlington, Texas, according to the source. The former Texas A&M star will visit with the Raiders on Sunday night and Monday.
It will not be the first pre-draft visit for Manziel, who has been projected as a possible first-round pick. The 2012 Heisman Trophy winner already visited with the New England Patriots this past week, according to sources.
The Raiders own the fifth overall selection in next month's NFL draft. Oakland acquired veteran Matt Schaub in a trade last month with the Houston Texans, but the Raiders could still potentially be looking for a long-term solution at quarterback.
The Raiders went 4-12 last season as Terrelle Pryor and Matt McGloin split time at quarterback. Raiders general manager Reggie McKenzie acknowledged last month at the NFL owners meetings that Pryor likely will be released or traded soon.