St Helens coach Daniel Anderson says star centre Jamie Lyon faces his most difficult challenge of the season so far at the KC Stadium on Friday.
Anderson has tipped Jamie Lyon to come out on top against Yeaman
The in-form Australian comes up against Kirk Yeaman, who is Super League's joint leading tryscorer after scoring eight tries in six games for Hull.
"Kirk's had a very good start to the season," said Saints boss Anderson.
"I have a very high opinion of him. He's a very hard, tough player, but Jamie relishes those challenges."
Lyon's contract finishes at the end of the season and he has been linked with a return to the NRL, possibly with Manly.
But Anderson has not given up hope of retaining the services of the former Parramatta player, who has been a massive hit and is the reigning Super League Man of Steel.
"We are still in there punching away," said Anderson. "It goes without saying that we would love to keep Jamie here."
Anderson is forced into at least one change for Friday's game after Paul Wellens suffered a facial injury in last weekend's 38-16 win over Bradford.
Ian Hardman and the versatile Leon Pryce have been earmarked to fill the full-back role against Hull.
"Ian Hardman has trained all year as a full-back," said Anderson.
"He's done every single session with Paul Wellens, so he's another choice. You'll have to wait until an hour before kick-off."
Wellens, who sustained a fractured cheekbone as well as potential eye damage, was initially ruled out for between four and six weeks.
"His eye definitely looked a lot better yesterday (Monday)," said Anderson.
"He tried to train with us but he had to be ostracised. We'll know more tomorrow when he sees the specialist."
St Helens have also been boosted by the news that forwards Mike Bennett and Nick Fozzard are available after injury.