Mathias Aaris Kragh Nielsen (born 2 March 1991) is a Danish footballer. He plays at centre back for HB Koge. Nielsen has 1 youth cap for Denmark, playing for the Danish under-20s.
A versatile player, Nielsen's preference is playing as a defensive midfielder, though mostly utilized at centre back and occasionally right back.
Bordeaux 
Ajaccio 
Luton 
Everton 
Arsenal 
Bournemouth 
Leicester 
Blackburn 
Borussia Dortmund 
FC Augsburg 
VFB Stuttgart 
Bayern Munich 
VFL Wolfsburg 
SV Darmstadt 98 
Werder Bremen 
Borussia Monchengladbach 
Celtic 
Heart Of Midlothian 
Real Madrid 
Cadiz 
Monaco 
Clermont Foot 63 
Monza 
Lazio 
Manchester City 
Wolverhampton 
Girona 
Barcelona 
Sassuolo 
Inter 
Mallorca 
Atletico Madrid 
Chaves 
FC Porto 
PSV 
Sparta Rotterdam 
Rangers 
Kilmarnock 
Volendam 
Ajax 
Dynamo Kyiv 
Kolos Kovalivka 
Chelsea 
West Ham 
Sampdoria 
Reggiana 
Espanyol 
Sporting Gijon 
AZ Alkmaar 
Twente 
Shakhtar Donetsk 
Chornomorets Odesa 
Liverpool 
Tottenham 
Eintracht Frankfurt 
Bayer Leverkusen 
AC Milan 
Genoa 
Roma 
Juventus