The Chelsea supervisor said: "Thiago can't play on Sunday.
"He did an individual meeting today, on the pitch, and it was a major advancement and stride ahead direct for him so I trust he will join the gathering one week from now."
Chelsea face a significant run of games in their offer to get Champions League capability.
After United, they face an excursion to Anfield and afterward take on another main four opponent in Everton.
"I would say the major event is consistently the following game as there could be no greater games than those you play all in all," said Tuchel. "At that point there are some exceptional apparatuses. Clearly a London derby and a Champions League game in Madrid (are large). "Presently Man United, Liverpool and Everton in the association is a progression of enormous installations and obviously huge groups who offer huge difficulties. This is by and large why we are here and we anticipate setting up the group from tomorrow onwards to be prepared on Sunday."
Chelsea are undefeated in eight games under Tuchel and on Tuesday put themselves on course for the Champions League quarter-finals with a 1-0 success against LaLiga pioneers Atletico Madrid.
Tuchel added: "I think it's anything but a joy to play against us, however the image isn't done. There's as yet far to go and we have a great deal of things to develop. This is a decent message and uplifting news. "There could be no alternate path than to remain hungry and improve each day. We need to do this as there's a great deal of things to improve. "I can plainly feel the demeanor and energy on the pitch that we have a solid bond, that we have solid rivals in our gathering. That makes us difficult to beat. "I feel emphatically that football is a collaboration. That you can be something beyond 11 people or 16-18 people as a crew.
"This is the thing that we need to make and to zero in on other than strategies, specialized and deceives that you can imagine or not. Interestingly, we have a solid gathering and this is the mindset that we feel uninvolved when I mentor the group, when I notice the matches. "This is the best inclination we can have. We are positively yet it isn't done."
Chelsea anticipated XI (3-4-2-1): Mendy; Azpilicueta, Christensen, Rudiger; Hudson-Odoi, Jorginho, Kovacic, Alonso; Mount, Werner; Giroud
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