Is Grimsby's defeat of Man United the biggest upset in League Cup history?

https://a.espncdn.com/combiner/i?img=%2Fphoto%2F2025%2F0828%2Fr1537778_1296x729_16%2D9.jpg
Man United aren't the only Premier League side to suffer Cup humiliation, ESPN takes a look at all the famous 'giant killings' in England's League Cup.
×