Tuchel's unbeaten start at Stamford Bridge came to a crashing halt at the weekend after they were beaten 5-2 by the Baggies but the coach feels it is a reminder to his team how tough winning matches can be.
He said: "It was a big slap in the face. If you take it from that result that we needed that reminder, OK let’s take it. But I could not see it coming. When I did the analysis I was tempted to bet a lot of money in the 45th minute that we would win it. But we did not. I didn’t see from the first 40 minutes that we were overconfident. But we got a big slap in the face and if it was necessary to remind us how tough it is to have clean sheets, we take it."
The Blues are widely regarded as favourites to beat the Portuguese side and advance to the last four and Tuchel suggests that the West Brom result will keep Chelsea "humble" in their approach to the tie.
He said: "It’s normal that people create stories around it and it’s absolutely normal that Porto will play their role as an underdog. They are a very strong team. How should we celebrate it? We come from a competition where you can obviously lose – we are able to lose to the 19th in the league 5-2 so we are the ones who know how humble you approach every game."