Foreign managers have a terrible record coming into mid-season relegation battles in the Premier League.
That could also be to do with that most coming in wouldnt necessarily be very good managers or be coming in much later in the season, with poorer squads and expectations. I know our squad has problems but there still some very good players in there performing badly.
Someone like Tuchel, and I still dont think he will want to come, is a very good manager on the shortlist of people like Bayern and Chelsea for next managers. Plus he could have say 27 games if he got the job during the international break which is plenty of time to get a team much higher up the table rather than putting someone in with 8 games to go and hoping they get to grips quickly.