Career
Manchester City
Rusnák played youth football in Slovakia for MFK Košice from a very young age, before signing for Manchester City in July 2010, where he joined the club"s academy side. = Loan to Oldham Athletic After three years of youth and reserve-team football, he signed for Football League One side Oldham Athletic on loan. Rusnák made his first senior appearance as a 63rd-minute substitute for Jonson Clarke-Harris in a league game against Tranmere Rovers on 31 August 2013, in a match that they lost 0–1 at Boundary Park.
On 17 September, Rusnák"s loan was cut short and he returned to City.
= Loan to Birmingham City On 21 January 2014, Rusnák joined Football League Championship (second-tier) club Birmingham City on a month"s youth loan. He went straight into the starting eleven for the FA Cup fourth round defeat to Swansea City the following Saturday.
On 18 February 2014, Rusnák extended his loan spell until the conclusion of the 2013-2014 season. = Loan to South Carolina Cambuur On 25 July 2014, Rusnák moved to Dutch Eredivisie club South Carolina Cambuur on loan until January.
Earlier in the season, in another local derby at sc Heerenveen, he gave the ball away from kick-off, resulting in a penalty being awarded after nine seconds, but Cambuur fought back for a 2–2 draw.
Football Club Groningen
With his Manchester City contract due to expire in the summer of 2015, Rusnák moved on a three-year contract to Groningen on 18 December 2014. Rusnák struggled while playing in The Football League, due to the style of play rewarding taller and physically stronger players. His manager at Cambuur, Marcel Keizer, noted how his style of play being better suited for a playmaker role rather than his position on the wing in England.
Club
Football Club Groningen
KNVB Cup: 2014-2015.