Former Maroons star Wendell Sailor has warned Queensland 18th man Edrick Lee to prepare like he will make his State of Origin debut, declaring the Canberra Raider has "come from nowhere".

The winger was a surprise inclusion in Mal Meninga's squad announced on Monday for next week's series decider, presumably as cover for Darius Boyd, who was named despite injuring his groin in Brisbane's win over Newcastle on Friday.

Raiders winger Edrick Lee is on stand-by for Origin III as Queensland's 18th man. Credit:Rohan Thomson

Meninga said Boyd is expected to recover in time but won't train until at least Thursday, meaning Lee is likely to train in his spot until he is fit.

It doesn't come much bigger for a 22-year-old Queenslander than making an Origin debut in a decider at Suncorp Stadium.