Arsenal won the 1997-98 premier league season, with Manchester United winning in 1998-99.
That depends on which league you are talking about. Arsenal won the Premiership in 1998.
Manchester United won the premier league in 1998
Lens won the French League championships in 1998.
Ajax won the Netherlands League championship in 1998.
The team that won the League Cup in 1998 was Chelsea FC.
The team that won the Scottish Premier League in 1998 was Celtic.
The team that won the Dutch football league in 1998 was Ajax.
The team that won the Greek Super League in 1998 was Olympiacos.
Celtic won the Scottish League Championship in 1998.
The team that won the Scottish League Cup finals of 1998 was Celtic.
The team that won the UEFA Champions League title in 1998 was Real Madrid.
Arsenal won 1997-1998 season. Manchester United won the 1998-1999 season.