According to information from Mundo Deportivo, Barcelona have rejected the option of bringing in the Belgian this summer, with him supposedly costing 18 million euros.
Wolfsburg's valuation of the player was about 5 million euros more than the valuation of Barcelona, and that was the reason that there was no agreement between the two clubs.
Barcelona therefore rejected the opportunity of signing Casteels, who would have come in and filled in the role left by the departing Jasper Cillessen, who is in search of a first team place.
According to Mundo Deportivo, Cillessen has several clubs interested in him, and although there have been no concrete offers as of yet, his time at Barcelona is over.