The team also signed Giorgio Tavecchio to serve as their kicker while Janikowski is on IR.
The Raiders' transition to Tavecchio will be somewhat easier on holder/punter Marquette King since the former Bear is left-footed, like Janikowski.
Janikowski's 1,799 points are the 10th most in National Football League history, and his 268 games and 17 seasons played are Raiders records.
However, as long as he keeps drilling field goals of more than 50 yards, Raider Nation is OK with the Milan, Italy native filling in for the Polish Cannon. Earlier this week, Janikowski had his contract reworked, lowering his base salary from $4.05 million to $3 million fully guaranteed, sources told ESPN's Adam Schefter.
Tavecchio has since been with Oakland at various points over each of the last four seasons. Mason Crosby converted under 64 percent of his field goal attempts past year, so the Packers are bringing in offseason competition. He missed a 36-yard field goal against Seattle and an extra point against Dallas. Having him back for the second half of the season would provide a big boost for Oakland.