Hull continued their signing spree on Thursday by adding two more faces to their squad for Super League IX.
North Queensland forward Paul McNicholas and Gateshead winger Richie Barnett have both agreed two-year deals.
Hull confirmed the capture of Penrith forward Ryan Benjafield on Wednesday and have also lured Brisbane's Richard Swain, Castleford's Michael Eagar, Halifax's Shayne McMenemy and Leeds' Peter Lupton to the KC Stadium.
The 6ft 7in McNicholas, 28, joins Hull on the recommendation of Penrith Panthers coach John Lang, who was also behind their signing of Ryan Benjafield.
Like Benjafield, McNicholas has a European passport through his Irish-born father - and director of rugby Shaun McRae believes he will plug the gap created by the departure of Wayne McDonald three years ago.
"John rang me a couple of months ago about Paul," said McRae. "He had worked with him for a couple of years at Cronulla and said he would do a good job for us.
"He will give us something we have lacked since Wayne McDonald left. He can do a lot of damage running wide out."
Barnett, who will line up alongside the former New Zealand captain of the same name, is being tipped for a bright future.
"He has enormous talent, good ability and tremendous pace," said McRae. "He will put pressure on the other guys."