Mark Hughes hailed the contribution of “outstanding” keeper Angus Gunn, whose saves helped Southampton beat Everton 4-3 on penalties.
The 21-year-old £13.5million summer signing from Manchester City made crucial stops from Bernard and Ademola Lookman during the Carabao Cup tie at Goodison Park on Tuesday night before denying Theo Walcott in the following shoot-out.
Gunn was an ever-present for Norwich while on loan in the Championship last season, and trained with England before the World Cup.
Making his second start of the campaign in the Carabao Cup he earned high praise from manager Hughes.
“We are delighted,” Hughes said.
“In each of the games he has been part of, he has given us a calmness and an assurance you need.
“He is an outstanding young goalkeeper. We had to move quickly because there was a lot of interest in him.”
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Hughes felt his side were “good value” for the victory that means they travel to Leicester at the end of the month in the next round.
“We wanted to progress.
We had good opportunities to increase the lead,” Hughes said. “We restricted a good Everton team to very few chances and kept the crowd quiet, which is always important when you come here.
“There was real determination to what we were trying to do. A number of guys hadn’t had much game time and credit to them, it is important to keep your focus and if you do you can come in and make an impact.”