German Bundesliga club Mainz 05 have struck a deal with SV Mattersburg over the signing of&nbsp; Karim Onisiwo.<br /><br />A product of SC Ostbahn XI, the attacker will remain at the Coface Arena until the summer of 2019 after penning a three - and - a - half - year contract.<br /><br />The 23 - year - old Onisiwo has represented SV Mattersburg for the last 18 months and played for SV Austria Salzburg and TSV Neumarkt before moving to the Pappelstadion.<br /><br />Bayern Munich wing - back David Alaba&rsquo;s father and Onisiwo&rsquo;s father are very close friends.<br /><br />Born in Austria, Karim Onisiwo can still feature for the Super Eagles as his solitary cap for the Austrian national team was in a friendly two months ago.<br /><br />Photo Credit : mainz05.de<br />