The 18-year-old full-back, signed from Chelsea last month, has played his way straight into the team and started all five of Saints' Premier League matches this season.
“Yes, I must say I'm super happy with this guy," said manager Ralph Hasenhuttl. “He was run out of energy in the end so we took him off.
“He shows every week how strong he is and when you play against such players like these you have to be good and one against one he is.
“He never stays, he is always going and that's what I want from him. Physically he is a good guy, a good height for a full-back, a fantastic player. But keep it calm – don't talk too much about him!
“I tell him that he will play immediately when he comes to us and I think that was something that helped him decide on coming to us.
“Kyle Walker-Peters was in his position but Kyle is now on the left. That tells you everything because Kyle was very important last season."
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