Bundesliga club Darmstadt said Wednesday they have sacked German-Tunisian midfielder Anis Ben-Hatira over his work with a controversial Islamic aid organisation.

Duesseldorf-based Ansaar International is reportedly under surveillance by domestic intelligence services for alleged links to Germany's ultra-orthodox Muslim Salafist community.

The 28-year-old Tunisian international -- who has hit out at what he called a "slander campaign" -- only joined bottom side Darmstadt in August, netting one German league goal and playing in 11 league games.

But following a meeting with the player, Darmstadt terminated Ben-Hatira's contract with immediate effect over his humanitarian work with Ansaar.

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