The men's team included a Year 13 student whose flashdrive containing all his school work was also stolen.
A player who spent his morning selling firewood lost a wad of $400 cash while others players lost about $400 between them.
In Auckland on Saturday, members of the Tauranga City Northern League First Team played against Waitemata Federation Football League and also had phones stolen from the changing room as they played.
Club co-ordinator Tony Pill said the room had been locked so he was unsure how the theft occurred but it was reported to police following the game.
Mr Pill said the club put signs up at Links Ave regularly to remind people to lock up personal belongings.
Mr Pill said the weekend's events provided a tough lesson for some, "if you leave the changing rooms, lock the doors".
Tauranga City United AFC president Ron Boyle said police were investigating.