Thomas Tuchel has set a record for the longest ever unbeaten start by a Chelsea manager, as he recorded 13 consecutive matches without defeat.
Chelsea beat Atletico Madrid 2-0 in the Champions League last-16 second leg on Wednesday night.
The result saw the Blues qualify for the quarter-final with a 3-0 aggregate victory.
The Stamford Bridge side were struggling when the club sacked Frank Lampard in January, after a season and a half in charge.
Tuchel was brought in after he was let go by PSG the previous month.
The 47-year-old has transformed Chelsea in his two months in charge, winning nine and drawing four of his first 13 games.