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Martin Koscelnik (born 2 March 1995) is a Slovak professional footballer who plays for Slovan Liberec and Slovakia as a right-back.

Koscelnik won the 2014–15 DOXXbet liga with the Zemplin Michalovce. He made his Fortuna Liga debut for Zemplin against AS Trencin on 18 July 2015. He was replaced in the second half by Martin Regali.

Koscelnik was first called up to Slovakia's senior national team on 25 August 2020 by the coach Pavel Hapal for the Nations League matches against Czech Republic and Israel.<\/P>","9CFA5380AB449F58B34CD68741B77812":"2","781CC09C30E6A152":"1","722D75C33935B48A":"75kg","5C3036D26CFC912788B0712D1AAE3BCF":"","5588923A723573201F6804A11C3F390A":"3","02EB7DF46653B329":"Martin Koscelnik","38882684D19FD665":"Martin Koscelnik","784E2315886D4158FF9CFFE843FE6B59":"","1D8DD001D97C012A":"180cm","B6A0187759F85483D714EA91FD933428":"0","F4645409D3EE42C9":"486","3D0C18FC6E83B9810B0FAD6BF04C7B64":"2023-8-29","805ACE40479B6E763FB50E182B20A495":"1995-3-2","B6A0187759F85483BB8FCFF97E557B3EF40C5B869FAFCEA6":"1","0108B3B67855A673":"535770","4CC9C981935F4DF5":"NAC Breda","FCD4DE51CBA4497A941CDE925DCB26D2":"Slovakia","70545F9392E8422F11E2D5550E456F39":"Rapid Wien","7CC3966A9B90B9412F1273E902F0953F":"Rapid Wien,Slovan Liberec,MFK Zemplin Michalovce,Zemplin Michalovce(U19)","e_index":8};