Iceland will face Nigeria at the Volgograd Arena on Friday after holding Argentina to a 1-1 draw on June 16.

"We expect a tough match. We are ready for it. It will be a totally different game [from that with Argentina]. You have to work together, you have to stick together and once you do it as a team anything is possible, you've got a chance," Gunnarsson told journalists.

The 2018 FIFA World Cup kicked off on June 14 and will continue until July 15, with the matches being played in 11 cities across Russia.