The Red Devils, who are through to their first semi-final for 19 years, are thought to have agreed a deal to sign former Kiwis Test winger Vatuvei - nicknamed 'The Beast' - from the New Zealand Warriors.
It is understood Salford are waiting for the 31-year-old to receive his visa before announcing the signing.
However, they hope to have him in the country in time to make his Super League debut against Leigh on July 21, a week before they play Wigan for a place at Wembley.
