Ghana winger Christian Atsu scored his first English Premier League goal for Newcastle United on Saturday.
Atsu put the hosts in front from a wonderful Matt Ritchie ball in the first half, before Xherdan Shaqiri curled in an equaliser from long range.
But Lascelles, who headed wide from a similar opportunity before the break, met another Ritchie delivery to win it.
Magpies forward Joselu had several chances to put the game beyond his former side, but found Potters goalkeeper Jack Butland in good form.
Below is a video of Atsu's goal