"He had a little accident yesterday in training with ball control and landed in a funny way on his ankle and on his Achilles," Thomas Tuchel said of Armando Broja at a press conference on Friday, as quoted by Chelsea's official website.
"So he's in pain but nothing major. We did all the examinations and it's just pain, and he's lucky that he did not get injured and we are lucky and happy that he did not injure himself.
"So he will not be in training today, he's in treatment."
The Albanian international joined Chelsea training on Wednesday. Tuchel also spoke about his chances of getting first-team football at the club this season.
"Armando is our player first of all, and we have at the moment no interest in selling him," the boss added.
"He is here to make an impression after he was on loan in Southampton. It's good there's interest [from other clubs]. It shows us that there is a talent and potential.
"Armando is in the position to impress, impress as a Chelsea and to become a Chelsea player. When? Nobody knows but hopefully as soon as possible.
"He got injured. It's never nice because the young players should normally make an impression during pre-season from the very first minute. Now we have a little delay in that."
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