As the final whistle blew, it was back to the drawing board for Rafa Benitez, with injuries to contemplate and the hole left in his side by Shelvey's suspension, further recruitment is clearly needed. The tackle on the later was particularly rash, as Harry Kane was duly booked for a conventional, poorly timed, striker's challenge.
Eriksen worked Rob Elliot four minutes before half-time with a dipping, 25-yard drive the goalkeeper saw all the way and was able to hold.
Speaking after the game, won by second-half goals from Dele Alli and Ben Davies, the youngster said: "I found out I was playing yesterday in training before we worked on tactics and shape".
The game suddenly burst into life, with Gayle forcing Hugo Lloris into a save at his near post, but Newcastle's positive response soon fizzled out.
Alli opened his scoring account in his first game of the season, building on his career-high 18 goals from last season.
Eriksen was involved for Davies' strike as his lay-off teed up the left-back and the Wales worldwide curled the ball into the far corner.
Pochettino said last week that Walker-Peters was not ready to play in the Premier League but he claimed he had been bluffing to avoid putting pressure on the youngster.
"If Harry Kane had scored to make it 3-0 at the end, that would have been a bit more fair", Pochettino told BBC Sport. The 48th-minute incident took place right in front of the referee, at a time when Newcastle was looking comfortable against one of the favourites for the title. It was a clear red card [for Shelvey].
"Still I would like to see if this is a more unsafe situation than the tackle from behind to Lejeune".