Johan Gunnar Gren was a Swedish professional football player and coach. He is best remembered for playing for IFK Göteborg and A.C. Milan.

Idrottsföreningen Kamraterna Göteborg, commonly known as IFK Göteborg, IFK or simply Göteborg, is a Swedish professional football club based in Gothenburg. Founded in 1904, it is the only club in the Nordic countries that has won one of the main UEFA competitions, having won the UEFA Cup in both 1982 and 1987. IFK is affiliated with Göteborgs Fotbollförbund and play their home games at Gamla Ullevi. The club colours are blue and white, colours shared both with the sports society which the club originated from, Idrottsföreningen Kamraterna, and with the coat of arms of the city of Gothenburg. The team colours have influenced the historical nickname Blåvitt. The blue and white are in stripes, with blue shorts and socks.