Kranjcar has struggled to get playing time at Spurs this season and has expressed his dissatisfaction about his lack of playing time.
Kranjcar turned down the chance to move to Werder Bremen in January, but may be tempted to move to Serie A this summer if Redknapp cannot give him assurances about his future.
“Niko is not happy with the situation at Tottenham at the moment. He wants to play. It is a shame that a man of Niko’s quality is on the bench,” Kranjcar agent Adrian Aliaj said. “He is loyal to the club and has a contract but it is difficult for him. It can be a problem when a player is not playing. When he is not playing he is not happy. He feels down.”