Merson has tipped the Blues to secure top four due to the bright start to life under the former Borussia Dortmund and Paris Saint-Germain boss.
Tuchel was drafted in to replace Frank Lampard after a poor run of form by Chelsea which left their top four hopes in tatters, but the German coach have since steadied the ship by taking Chelsea from ninth to fourth on the Premier League table.
Chelsea have been unbeaten in their last nine league games and have won against other top four contenders like Tottenham Hotspur, Liverpool and Everton.
In his latest Sky Sports column, Merson lauded Chelsea and Tuchel amid their current run of form.
He wrote: “Everything is going right for Chelsea and Thomas Tuchel, at the moment.
“They've had two big results against Liverpool and Everton to continue what has been an unbelievable run and full credit has to go to Tuchel.
“They were a real handful against Everton, and Kai Havertz epitomized that. We finally saw his best on Monday, he was simply outstanding. I didn't realise how quick he was! He was a real handful and the decision to bring him in last night was rewarded.
“When you are winning every week that's what happens.
“The problems he has now is Havertz just had his best game for Chelsea by a million miles, but I'd be surprised if he plays next week. Mason Mount was outstanding against Liverpool but then he didn't play against Everton. They look really good.
“The one problem I still see is that they don't score a lot of goals. For all the game they had against Everton, I thought it was a game where they probably could have blown the opposition away. Some of the passing and some of the movement was outstanding.
“I really like the manager. He looks really good and has made a really impressive start at Stamford Bridge.’
