[3][4] He established a strong partnership with Emil La Cour in the central midfield, and he was, among other things, involved in FC Fyn's promotion to the 1st Division (second-tier) in the 2011–12 season, where the club beat HIK in the decisive playoff match for promotion.

[5] After his first six months at the club, he was named the 2013 Autumn Profile in January 2013 by the Viborg fan group Grøn Fight.

[6] Grønning became a regular part of the first-team squad that reached promotion to the Danish Superliga in the summer of 2013, but due to injuries he only made five appearances in the highest tier before being loaned out to Hobro IK in the second-tier.

[7] In Hobro, he helped secure the club its first promotion to the Superliga ever, when after the 2013–14 season ended in second place and moved up alongside Silkeborg IF.

[8] In December 2015, he was once again voted as "Autumn Profile" of the club in a poll on Viborg Stifts Folkeblad.