Calvin Bassey has been told to step up and improve at Ajax amid the Rangers defender forming part of a leaky defence.
The Dutch side are competing for second spot in Champions League Group A, with the Light Blues already out of the competition after four sobering defeats. Giovanni van Bronckhorst's side have conceded 16 goals with one scored but the Amsterdam club haven't fared much better, losing 12 over their four games.
They haven't kept a clean sheet in eight attempts ahead of hosting Liverpool on Wednesday and club captain Tadic insists the likes of Bassey - who joined the club from Rangers in the summer - need to sharpen up in their new-look plans. He told AD: "They have to get used to what we want and we to what they are good at. They have to help attackers with that. You see that this can be done better, especially in top duels.
