Alot is going on in the team currently, from the poor investment, to the injury crisis, to lack of confidence level of the team and that's why the team is suffering badly lately, and to make the whole situation worst, one of their key players Malo Gusto got booked with a red card in the match against Aston Villa, which puts more pressure on the coach due to lack of options, well Chelsea dominated the game and created some chances but couldn't convert to a goal due to lack of a good finisher.
Pochettino needs to think fast because they'll be facing Brighton in their next match at Stamford Bridge, but they're going to get it very tough, because Brighton have been in a very good form this season, and if he continue losing he might end up losing his managerial role very soon.
Brighton is doing great this year as well, it will certainly be a troubled game for them and the likely outcome would be Brighton winning as well. I have to say it is going to be hard to continue with this, we need to realize that Chelsea needs a bigger overhaul than just players, spending money like crazy is not the way to go and they must have figured that out by now. They can't just get one star player neither, because when rest are bad, you can't have that.
So, they need something that will change the club structure, and a new manager is not the solution as we have seen with the past 3 managers so far. They need some fundamental changes, and you can't do that during the season itself, and failed at it during summer as well.