Chelsea have re-signed Romelu Lukaku from Inter Milan, soon the club is expecting to announce him soon after his arrival.
According to Euro Papers, his transfer cost Chelsea £97.5m, Tuchel believes he could change the attacking side to his strength ang speed.
“We’re happy to have Romelu back in the club; we think in terms of personality, speed, power, he can be hopefully an excellent choice for us,” said Tuchel.
“He has the power, the physique to help us, he has the experience, the personality to have a huge impact. He is at the same time a humble guy, and a true team player player and he cares about Chelsea.
“We had the feeling that it’s worth to try and fight hard and we are happy he is our player now.”
Abraham will be involved against Palace this weekend, with Tuchel not ruling out a potential move before the transfer deadline.
“There are always possibilities that players leave us. The situation for Tammy is clear. I spoke many times about it. At the moment, there is no news about Tammy,” said Tuchel.
“We have a good relationship, he is our player and he is in the squad tomorrow, he has the chance to play and be decisive for Chelsea and this is where the focus is.
“The next days after that we will see what happens, what is Tammy’s wish, what are the possibilities but right now the focus is for Saturday and there is no news for his situation.”