Trevor Bayliss hinted the hammering England took at the hands of India and Karun Nair on day four of the fifth Test may have a bearing on whether Alastair Cook decides to remain as captain.
England's chastening tour of India reached a new low as Nair hit a triple century in only his third Test to power India to their highest score in the longest format - the hosts eventually declaring on a mammoth 759-7.
The tourists reached the close 270 runs behind going into the final day and, though they still have all 10 wickets remaining, face the possibility of slumping to a 4-0 series defeat in Chennai.
Asked if the day could impact Cook's decision, Bayliss - who will not attend the final day as he is to fly to his native Australia for a hernia operation - said: "Possibly. That's a decision only he will know the answer to."
Cook is due to speak with director of England cricket Andrew Strauss in an end-of-year debrief after drawn series' with Pakistan and Bangladesh as well as the humbling by India.
"He's done it for so long, whether I say yes or no, it won't change his mind whether he keeps going or stops," Bayliss added.
"If he keeps going, fantastic; if he stops, that's up to him, and I've got no problems with that either.
"I won't actually sit down to have a chat with him. We've got six or seven months till our next Test match, so there's plenty of time for him to have a think about it.
"I'm not going to put words into Cookie's mouth or try and get him to make a decision one way or the other.
"He's been around long enough, and knows his own mind, to make the right decision. I think he deserves everyone letting him do that."
Assessing England's performance, Bayliss said: "We got totally outplayed, for sure... we just weren't in the game.
"But the one thing, throughout the five Tests here in India and two in Bangladesh, is that I can say the guys haven't stopped trying.
"On this tour, we've been outclassed - you put your hands up and say 'well played, India'.
"They've batted better than us and bowled better than us."