This match is really hard to predict... Chelsea still hasn't completely won me over, even though their performance is gradually getting better. The return of some players from injury might be the key to the top-notch performance Chelsea could display.
If the performance shown against Manchester City can be maintained, then there is a big chance that Chelsea can beat Newcastle in the match played at St James Park. Moreover, several players have returned from injury so there is no reason for Mauricio Pochettino not to be able to beat Newcastle if Chelsea wants to move up to the top 4 of the Premier League standings.
However, Chelsea's performance when holding Manchester City with a big score was a very good result and it can increase the players' confidence ahead of the match against Newcastle later. It seems that away matches are not a problem for Chelsea as long as they can provide the same resistance against Manchester City and indeed the return of Chelsea players who have recovered from injuries will make them even stronger. Pochettino doesn't seem confused anymore and he will definitely have put together the right formation against Newcastle and will definitely try to steal full points.