Sheffield United boss Chris Wilder was sorry to see Frank Lampard sacked by Chelsea.
The Blades meet Thomas Tuchel and Chelsea tonight.
Wilder said, "I know that they have replaced Frank with a very experienced, world-class manager. That's the standard of the football club.
"I was very disappointed that Frank had gone and similar to a lot of managers regarding time and processes that Frank had put in place to develop that group and move it forward.
"There's a couple of players come out of the team and a couple gone in but whatever system and whatever tactics they still have world-class players that they have paid huge amounts of money for, a huge challenge and one that we look forward to."