Villarreal were the defending champions, having defeated PSV 4–2 in the previous season's final, but were eliminated in the group stage.
Qualification
Twelve teams in Premier League 2 were invited to represent England in the tournament, while European teams that qualify for the knockout stages were guaranteed an invite for the following season's competition. The teams were split into six groups of four - with two English league clubs per group. The group winners, and two best runners-up, progressed into the knockout phase of the tournament. The knockout matches were single leg fixtures.[2]
All matches - including fixtures between non-English teams - were played in England and Wales.
The draw for the group stage was held on 28 July 2016.[3] The teams were drawn into four groups, each containing two English sides and two European sides.
Color key in group tables
Group winners and the two best runners-up advance to the quarterfinals