The
Swiss Football Association (SFV-ASF) were changing the format of the
Swiss football league system to the beginning of the following season. Up until and including this season, there were 56 clubs in the 1. Liga, divided into four groups of 14 teams. This was to be reduced to 48 teams and would be divided new into just three groups of 16 teams. These would then also include the best youth teams of the professional clubs from the
Super League and the
Challenge League. The Swiss youth U-20 championship was to be despanded, these teams would then be called U-21 and would be eligible to play in the third tier or fourth tier. The four top teams in this last U-20 championship would advance to the new 1. Liga. This all meant that the number of relegations this season was increased to twelve. In the 1999–2000 season, the 1. Liga clubs were divided into four regional groups, each with 14 teams. Within each group, the teams would play a double
round-robin to decide their league position. The four group winners and the four runners-up then contested a play-off for the two promotion slots. The three last placed teams in each group were directly relegated to the newly named
2. Liga Interregional (fourth tier). ==Group 1==