Currently on loan at Gerrard's Rangers, the Ibrox boss is not hiding the fact that wants both players permanently.
He said, "Are you bugging my phone? I'm still in Jurgen's good books for the foreseeable future and Liverpool keep winning, so maybe there is some scope, but we rate them very highly.
"We have to be respectful to their parent clubs. The three players you've mentioned and Joe Worrall in time will be added to your list – he's already on mine.
"They are players we've gone for because we rate them very highly. Three of them have settled really well, Joe had a really tough debut [against Villarreal] but came through it very well in my opinion.
"In an ideal situation, they are all on four or five-year deals but unfortunately it doesn't work like that.
"If you're asking me if I'd want the four of them for next year, I'd sign the four of them right now."