Southampton are chasing the Hoops striker for the summer market.
"He came as a relatively unknown player from Scunthorpe and is now one of the top players.
"Quite rightly, he will be looking to get a wage increase. We don't have a problem with that.
"I can't see us not agreeing to a deal for him. We have already had preliminary talks with his representatives and they will continue for the next few weeks."