The 17-year-old was a surprise starter at home to Crystal Palace and went off the bench to replace the impressive Diego Gomez at Aston Villa.
Howell kept it simple against Palace but looked more confident at Villa as he whipped in two dangerous crosses in quick succession.
He will hope to have a part to play on FA Cup night at Anfield.
Head coach Hurzeler said: “I think also against Palace he played a good game.
“We shouldn't forget his age in the end. We know what he's capable of doing. He shows that in every training session every day.
“It's very important that he keeps doing the things he's showing us in training and when he came into the game, he had an impact on game.
“He showed some good actions and therefore we were pleased with his performance.”
Howell has come back from the disappointment of missing the Under-17s World Cup with England.
While it was understood he was of interest to clubs including Bayer Leverkusen, Albion had no intention of allowing him out.
He put in hard yards for the under-21s and for the under-18s in the FA Youth Cup tie at QPR.
Brajan Gruda started on the right in the third-round tie at Manchester United and scored in a 2-1 win.
His loan move to Leipzig appears to have opened up more opportunities for Howell but Hurzeler said that was not a plan.
He told The Argus: “Generally, we always try to see the individual positions separate from each other.
“We always try to figure out what is best for the individual player.
“We had the feeling that, for Brajan, it was the best to go on loan, to get more game minutes then he might get here.
“And, for Harry, it was the best to stay. It's always a decision we try to make together with the player, always thinking what is best for the club and what is best for the team.
“After that, we come together, make a decision, and that was our decision regarding these two players.
“But we have to see them as separate cases.”