When I try and set-up a modem link (dialling or receiving) it tells me that a connection has been established then within a few seconds I get the message “has left the game”. Can anyone help?

what is the other person's modem brand/speed?

This could be due to incompatible modems. Anyway, fifa series have been notable for their lousy performance on multiplayer issue especially modem play. I have tested fifa99 on modem connection and it really lousy and pointless as the performance sux.

Both modems are 3com v90