Kranjcar struck twice in Tottenham's FA Cup win over Peterborough United.
Redknapp said: "I enjoy watching us play. The two Croatian boys move the ball about fantastically.
"When I first took Kranjcar at Portsmouth, Slaven Bilic (Croatia manager) raved about him.
"They are just fantastic boys. Not a minute's problem. They get on with it. They've got great football brains, great ability.
"They are a dream for a manager. They just enjoy playing football and are technically gifted."
Modric is still feeling his way back after recovering from a broken leg earlier this season and Redknapp expects the Croatian pair to have an extended run win Aaron Lennon's absence.
Redknapp said: "They don't stand out wide and get marked. They come into positions where opponents can't find them. They're in little holes and they have that knack of doing that. They do it so well.
"There's no reason why they can't have a good run together because Aaron is going to be out for a good while."