Serious trouble?
Genuinely..........why? And what constitutes "serious trouble"?
Spurs are currently second in the form table and, but for a number of bad VAR calls against them since the restart* (not to mention a number of bad VAR calls for Man Utd!), they would likely now be one point off the top four with Leicester still to play. Such an outcome was unthinkable when Mourinho took over, with the team in disarray. For what it's worth, had the season started when Mourinho took over at Spurs, we would now be 4th. Is that what you mean by "serious trouble"?
No doubt that Spurs' attacking play leaves much to be desired currently. But their defensive solidity has improved greatly since lockdown. No one who has watched Spurs regularly over the past 18 months could fail to see it. That's Mourinho's MO. Get the defence sorted first. That's the foundation upon which everything else is built.
Make no mistake, I'm no Mourinho apologist. He wouldn't have been my choice. But I have had to acknowledge that he is doing an effective job. Serious trouble........? Well, I'll concede that Spurs won't be pretty next season and won't challenge for the title. Beyond that, though, a top four challenge will certainly be on the cards. And maybe a trophy.
* Just to be clear, I'm not complaining that Spurs have been especially hard done by. I'm well aware that Spurs had a number of decisions go their way earlier in the season when Poch was still at the helm.