This comment in the article above is quite good:
"Mauricio Pochettino realised that the best way to use him: not on the flank where he would inevitably get squeezed out, but in the centre, where opposition teams never quite know where the ball was going next, because often neither does Sissoko. The injury to Mousa Dembele has been particularly timely in this respect: Dembele is the sort of player you bring in when you want to control a game. Sissoko is the sort of player you bring in when you want to control an opposition."
Similar to my comment about whether the Dier-Sissoko partnership would work against more defensive teams
"Mauricio Pochettino realised that the best way to use him: not on the flank where he would inevitably get squeezed out, but in the centre, where opposition teams never quite know where the ball was going next, because often neither does Sissoko. The injury to Mousa Dembele has been particularly timely in this respect: Dembele is the sort of player you bring in when you want to control a game. Sissoko is the sort of player you bring in when you want to control an opposition."
Similar to my comment about whether the Dier-Sissoko partnership would work against more defensive teams