If your city tile has a field side, which fits on all sides somewhere to the board, you can connect it there. (And claim the new city, if you want.) Only if you draw for instance a tile with city on all four sides (there is only one in the base game), you have to connect it to a city, if possible. If not possible at the time, it is drawn, you have to discard it, and the tile will not be used in this game.
Started by ac1982
Started by Allograft
Started by drone2
Started by MrNumbers
Started by NGC 54