[2] During the 1985 season, CR Vasco da Gama toured Australia, playing against various teams in a series of games.

Maintaining his job for the inaugural season of the A-League, Kosmina led his side to the Minor Premiership but a poor finals series saw them finish 3rd overall.

Kosmina's criticism of the refereeing of that match, coupled with the devastating loss and a touchline ban earlier during the season for a scuffle with Victory captain Kevin Muscat, saw him forced to resign by the Adelaide board.

Following Sydney FC's poor run in the 2008/2009 season (missing the finals for the first time), John Kosmina had his contract terminated in late January 2009.

[9] It was announced on 18 December 2011 that Croydon Kings had agreed to release Kosmina from his coaching contract so he could accept the Adelaide United manager position.

[13] In August 2015, Kosmina was appointed senior coach and football leader at National Premier Leagues Queensland club Brisbane City, signing a three-year contract.

[17] This decision came after a poor run of form which saw the Strikers not take a single point from their first ten games in the 2021 NPL Queensland Season.

Kosmina co-hosts a weekly Internet television show about football on Australia Live TV with Ross Aloisi, Two Up Front[19] and the episodes are on AustraliaLiveTV.com Archived 31 May 2019 at the Wayback Machine.

The award given to the player of the match in the National Premier Leagues Grand Final each year is named in his honour.