Callum Hudson-Odoi has admitted he was worried he would never play again after rupturing his Achilles last season.
The 18-year-old missed Chelsea`s Premier League run-in, the victorious Europa League final and the Nations League with England as a result of his injury.
He has made an impressive return, registering three assists and a goal in four games, but told Sky Sports News about the doubts he encountered after sustaining the injury.
He said: I wondered if I would be able to play again; that was my first thought. I knew I`d done something really serious so I was really concerned.
But my family kept me confident that I`d be back to how I was.
There were days when I would go into training and I would be sad or disappointed because I could see the boys outside training and you just want to be out there with them.
So I had the dark days but at the same time I had positive days as well.
Hudson-Odoi`s injury came just as he was establishing himself in Maurizio Sarri`s Chelsea side, as well as the England senior team.
When it came, it was more anger for me because everything was going as I wanted it to go, he said. I was playing games, I`d got called to the national team - everything was going perfectly.
There were big games coming up. But I knew when I came back I`d be stronger than I was before.
New Chelsea head coach Frank Lampard has praised Hudson-Odoi`s impact since his return last month, and the winger said: It`s an amazing feeling.
I was out for three to four months and it was crazy to even get the injury in the first place. It`s something I had to deal with mentally because I`d never experienced an injury like that before.
I`m really delighted with the way I`ve come back. I didn`t expect to get this many assists and to contribute with a goal as well. Hopefully I`ll keep improving and adding goals to my game.