Steve Harper says the sale of Andy Carroll could bring in four top quality players. Steve Harper: "Let's stay up and hang on to the quality players. "It is not just adding good players and good people. It is about hanging on to the likes of Jose Enrique, Joey Barton, Cheik Tiote - who has just got a long new deal - Kevin Nolan, people like that who've been key figures in and around the club. "Hang on to the people who have kept us here and then add three, four, five players in key areas to kick on. "The fact of life in football is that every player is for sale. Messi, Xavi, Ronaldo, every player has a price. "Andy Carroll was going to be missing a few weeks with injury. I am sure it will prove fantastic business when the money is spent by us in the summer, provided we stay up. "We could add four top quality players with it. In key areas. People may look back and say what good business it was for everyone. I hope so."