The Steelers are losing two of the Killer B’s.

A pair of J’s hopes to replace one of them.

A day after Pittsburgh agreed to send Antonio Brown to the Raiders in exchange for third- and fifth-round draft picks, JuJu Smith-Schuster, the now undisputed No. 1 receiver for Ben Roethlisberger, agreed to take on the challenge.

“I’m Ready…” he tweeted, attached to a picture of his catching a touchdown pass — with Brown fading in the background, watching his former Robin take control.

The 2017 second-round pick has lived in Brown’s shadow, but no longer. Playing alongside the disgruntled superstar, Smith-Schuster was a quieter star, catching 111 passes for 1,246 yards and seven touchdowns last season, after which he earned a Pro Bowl slot.

Of course, the question will be how he performs without defenses shifting toward Brown’s side of the field. And without defenses creeping forward to neutralize the threat of Le’Veon Bell, the next killer B to go.

Smith-Schuster is ready to find out.