Danny Ings was denied an all-important equaliser by VAR as Southampton slumped to a 1-0 home defeat to Aston Villa on Saturday.
Ross Barkley, who is on loan from Chelsea, fired Villa into the lead at St Mary's before half-time.
Southampton thought they had snatched an equaliser deep into second-half injury time as Ings had the ball in the back of the net.
However, the 28-year-old Southampton forward was ruled offside by a tiny margin, with the Saints once again losing out on a VAR call in their favour.
Speaking after the 1-0 win, Cash admitted that 'luck was on their side' and called it a "fantastic result" for Villa.
The 23-year-old right-back told Sky Sports: "This is a tough place to come, but I felt we defended really well.
"A welcome three points. We had a lot of great characters everywhere.
"We watched them in the week, they are a fantastic team and move the ball really well, but this season we have been fantastic defensively so to come here and take a clean sheet is fantastic.
"Luck was on our side. A fantastic result, we can build on it."
When it came to the controversial VAR decision in the first half, Cash explained: "It is hard to defend with your hands behind your back -- sprinting around at full pace.
"I think it hit my quad first, the rules are a bit bad at the moment."
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