Ipswich Town edged closer to promotion with a goalless draw at West Brom, while Oxford United have been relegated from the Championship.
Leicester City will play in League One for the first time since 2008-09 after drawing with Hull City, while Coventry City won the title.
With Ipswich Town not playing until Sunday, Millwall took full advantage to leapfrog the Tractor Boys into second place in the Championship.
The automatic promotion race in the Championship opened up with Ipswich Town losing to Portsmouth, while Southampton moved up to fourth.
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