The main gripe, though, was the way Liverpool conceded so many cheap goals and he promised they will be working on eradicating them in the coming days, when they head over to Boston for the latest phase of their United States tour.
Liverpool are without their first-choice front three in the USA as Mohamed Salah, Sadio Mane and Roberto Firmino bring arduous worldwide summers to an end.
But he has impressed in pre-season, striking his fourth in three games - a penalty against Dortmund in Friday's US tour fixture - and Sancho says it is a taste of what is to come. Sevilla are playing nearly their best team and I see them having enough quality to defeat a depleted Liverpool outfit.
After Daniel Sturridge left Anfield at the end of the season, Brewster was immediately moved up in the pecking order, but is still likely to find himself behind Origi, Salah, Firmino and Mane.More news: England Women's hopes of regaining the Ashes appear to be in tatters
'I saw a lot of good things. I have played with him.
And when asked if he thinks people will be talking about Brewster in 12 months' time, Sancho said: "I think so".
Liverpool ran out of time in the hunt for an equaliser but it was a good run out as more members of the first team begin their involvement in pre-season.
"He is a great player", he told ESPN.More news: SpaceX Starship could re-transport humans to the moon in few years
The England global, who was involved in just four matchday squads last season as he recovered from multiple ligament damage, was the standout star for the European champions at Notre Dame Stadium. Whoever didn't know it, come to Notre Dame - it's brilliant'.
Rhian Brewster reduced the deficit from the penalty spot with a supremely confident take for his fourth goal in three games after Ben Woodburn was impeded by Mateu Morey.
"He spends time after training, practicing and practicing his technique".
"How we conceded the goals was due to lack of organisation around the situations". I feel like he is at the right club, he is developing and he is still so young. It's a good thing for us to have someone like him. "Just give him the time and be patient and you will see".More news: Watchmen Comic-Con Trailer Teases Masks Are Dangerous
It has been a fruitful summer so far for the England starlet who is back after a long-term ankle injury and he will look to add to his tally when the Reds face Sevilla tonight at Fenway Park in Boston.