Robbie Neilson wants Hearts fans to focus on pushing the clubs into Europe rather than on John Souttar 's decision to depart.
A section of the Tynecastle support are up in arms over Souttar's decision to pen a pre-contract with Rangers.
Neilson admits he can understand the disappointment of losing a key player but called for the Gorgie faithful to back the side.
Asked what he would like to say to fans over the deal, Neilson said: "The most important thing is the football club.
"Myself, the rest of the players, the staff, everyone, it is support for the club going forward.
"No player is bigger than the club, no player will ever be bigger than the club.
"People will come and go, the most important thing is come and support and help us get the three points for the club.
"I understand the frustrations of fans, there is a disappointment there but at the end of the day it is about winning tomorrow, taking this club forward and trying to get European football which will take us to the next level again."
Despite agreeing to move to the Premiership champions, Neilson has insisted he has no issues with selecting the Scotland cap in the clash with St Johnstone after talks with Souttar.
He said: "The objective is to try to get European football so we have to utilise the squad and play our best players and John is one of our best players so he will be available for selection until things change.
"We offered John a contract, he decided to turn it down and the way the Bosman rule is he can go and speak to people and we knew he was speaking to clubs and he has decided to go somewhere else.
"I have spoken to John and he understands the situation and he is big enough and old enough that he has to make sure his head is right.
"He has reassured us that he will give 100 per cent in training which he has done and 100 per cent if he is selected.
"Obviously we are disappointed but at the end of the day the club is and always will be bigger than any one player.
"The most important thing is we focus as a club and a team and get ready to win the game tomorrow night and then move forward."
