Chelsea manager Antonio Conte was only half satisfied after his side battled to a 3-2 win against Bristol Rovers in the League Cup on Tuesday night.
Striker Michy Batshuayi was again on target as he was joined by winger Victor Moses on the scoresheet.
The Blues struggled in the final stages of the game and Conte made it clear that his players should have put the game to bed earlier.
"We must understand that when you have the opportunity to kill the game, you must kill the game," Conte told reporters.
"It's a pity because we were dominating the game but then we suffered. Tonight I knew the English cup, I knew the atmosphere, and I can tell these games are very tough for all.
"We created a lot of chances in the first half to score many goals, but I don't like when you concede two goals in this situation, from a free-kick and a penalty.
"When you leave it open a situation like tonight can happen when you stay afraid of drawing the game until the end."