Widespread reports have claimed that the Portugal captain would be open to rejoining the club he signed for when he was a teenager because he has become disillusioned with life in Spain.
When asked by reporters in this afternoon's press conference if he would want to sign Ronaldo should the chance arise, Van Gaal said: "It's possible. It's always a discussion in the papers and I don't think the media shall buy Ronaldo. I have always said with [Radamel] Falcao and players like Ronaldo, they give a lot extra to a selection or a team but I don't think Real Madrid shall sell."
Ronaldo signed for Real back in 2009 for a then-world record fee of £80m, which was eclipsed when Madrid bought Gareth Bale from Tottenham Hotspur for around £85m.