International Institute of Cricket Umpiring & Scoring
Team manager takes charge at the toss
"Because of heavy traffic, we were all very late arriving at the ground for the match. The only club member
who had arrived more than fifteen minutes before the start of play was our Team manager.
When we arrived we discovered that he had given in the team list and tossed up. Is he allowed to do this?"Unless League or competition rules say otherwise, the Laws state that, at the latest, the toss must take place fifteen minutes before the scheduled start of play, and after the nominated team list has been given to the umpires. Anyone can do this.
But after the toss, any further decisions can only be made by a member of the nominated team, so I hope your Team manager didn't try to decide whether your side should bat or bowl!
Read more about Law 1 (The players) at the MCC website