"There is a great amount of young English talent in our game," said Cullen. "Super League is healthier than some people might credit it.
The squad could yet be boosted by players dropped from the Great Britain squad ahead of the Lions’ warm-up game against a Newcastle Select XIII on Friday.
Cullen has yet to name a captain for the side, but the decision will be announced on Thursday.
C Ashton (Wigan), R Bailey (Leeds), M Calderwood (Wigan), M Cook (Bradford), P Cooke (Hull), E Crabtree (Huddersfield), M Diskin (Leeds), E Dowes (Hull), B Ferres (Bradford), A Gibson (Leeds), G Horne (Hull), J Jones-Buchanan (Leeds), R Purdham (Harlequins), L Radford (Hull), J Rooney (Wakefield), L Smith (Leeds), N Scruton (Leeds), R Whiting (Hull), D Williams (Leeds)