"And Liverpool and Man City will do everything to even make their squads bigger.
"They set the standard so, so high and it will take the same to be competitive next season. While like everybody else tries to close the gap to us...the two top teams are what they are, a benchmark of consistency.
"That's the situation and from there on we do our very best to be competitive because this is what we want to be."
Chelsea will be under new ownership next season as a group led by Todd Boehly is purchasing the club from Roman Abramovich for £4.25billion.
"It is going to be very difficult because even if we keep the team and have maybe the chance to add one or two key players it would already be difficult," Tuchel said.
"Maybe even very difficult. Still we are not sure if we play the same season again.
"It was an incredible season from (City and Liverpool) and in the end I don't lie to myself."
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