Livingston have accepted a club-record fee from an English Championship club for Lyndon Dykes and say the striker will be "sorely missed".
Queens Park Rangers have reportedly made £2m bid for the player, who was left out of Sunday's draw with Rangers.
Livingston previously turned down two offers for the Australian-born player, who they expect to conclude his move "over the course of the week".
The fee exceeds the £1m received from Celtic for David Fernandez in 2002.
"It's now up to the big man to go and decide and negotiate his side of it," manager Gary Holt told BBC Radio Scotland.
"He goes with the good grace of the club. We're buzzing for the big man. He's embraced how we work. Every single one of us are over the moon for him."
Head of football operations David Martindale said everybody's job at the club "just got that little bit harder" but that Livingston could not deny him the opportunity.
"It has also given a bit of added financial stability that is more than welcome given the current climate," he added.
Dykes has scored 14 goals in 36 appearances for Livingston since arriving from Queen of the South in 2019.