5. Keano
“Roy Keane. Plenty of players can pull off the psycho look – but go and ask Alf Haaland if Keane will follow through on his glare or not,” Sicks3144 wrote on Reddit. The incident he referred to was when Keane deliberately attempted to break Alf-Inge Haaland’s leg in 2001. This was an act of vengeance after Haaland mocked the injured Manchester United captain as he lay in agony on the field in 1997.

Keane waited four years to get his revenge. In short, the former Ireland international is one of the most intimating soccer players ever. He infamously walked out on his country in 2002 after a feud with coach Mick McCarthy in Saipan. Furthermore, many of his former teammates admit that he terrified them. A relentless midfielder, Keane was a quality player but also played on the edge.