After a turbulent spell, the club has had no time to pause.
Former head coach Eddie Howe has departed and, over the past year, key figures Alexander Isak, Bruno Guimaraes, Sandro Tonali and Anthony Gordon have also moved on.
Travelling supporters leaned into dark humour, reworking a familiar chant that once named Guimaraes and Isak — now with Arsenal and Liverpool.
Their version spoke of a new midfield linchpin, Sven Botman anchoring the defence, an option in attack and Newcastle charging towards the Premier League title.
It’s easy to see those gaps being claimed by the next generation.
The squad’s average age has dropped sharply, and 28-year-old forward Harvey Barnes was Newcastle‘s oldest starter against Valencia.
It felt like a glimpse of the future as 24-year-old goalkeeper Lukas Hornicek, 20-year-old midfielder Aladji Bamba and 20-year-old forward Toure made their debuts, while 18-year-old Steur impressed from the bench.
Jaissle’s track record of developing youngsters at Red Bull Salzburg was a major attraction for Newcastle, and he understands exactly what these players need.
He stressed that time is essential: young players face a tough path at the highest level, but the staff are committed to guiding them.
Malick Thiaw was among the senior figures as he captained Newcastle on his 25th birthday, and this side will need youthful energy to deliver Jaissle’s intense style.
Jaissle was a constant, vocal presence on Saturday, urging his players up the pitch and rarely staying within his technical area.
At times he even raced down the touchline in step with his team’s forward surges.