Leeds Rhinos are considering taking legal action against James Segeyaro and have placed a hefty valuation on the hooker as he attempts to orchestrate an early release from his contract.
The 26-year-old Papua New Guinea-born Australian, who has two years remaining on the deal he signed with the Super League side earlier this year, does not want to return to the UK for the 2017 season, citing homesickness.
Rhinos chief executive Gary Hetherington said in a statement: "We take this matter very seriously.
"James' decision has created a big problem for us and created uncertainty throughout our organisation.
"We are aware of the interest in him from a number of NRL clubs but we have our interests to protect as well and need to consider all avenues in this matter."
According to the statement, Leeds value Segeyaro at £250,000 and have engaged legal advisors as they consider "proceedings against him over breach of contract".
Wing Denny Solomona and half-back Chris Sandow have also failed to report back for pre-season training with Castleford Tigers and Warrington Wolves respectively.