Khan, a ball after streakily edging through the slips for four on the third day of the second Test, appeared to take offence at a comment made to him by one of England's close fielders and waved his bat in their general direction.
South African umpire Ian Howell moved in to nip any potential trouble in the bud and, at the end of the over, both he and Australian colleague Simon Taufel spoke to Andrew Strauss, captaining England with Michael Vaughan temporarily off the field.
When Vaughan returned, the officials spoke to him as well.
"Test cricket is a hard game," said England wicket-keeper Matt Prior. "We all want to win. You are going to have banter but no-one overstepped the mark."
Players are bound by the International Cricket Council (ICC) code of conduct which is designed to keep on-field behaviour within acceptable bounds.
Those found to have broken the code face punishments ranging from a fine, for a minor offence, to match suspensions for more serious offences.
However, after play on Sunday, an England and Wales Cricket Board (ECB) spokesman said he was unaware of match referee Ranjan Madugalle calling a disciplinary hearing.
"I don't know what was said between any of the players and umpires," Prior said.
"If I'm honest with you, if I did hear anything, I'm not going to tell anyone either because what happens on the pitch stays on the pitch."
This incident was not the first time this series that 'sledging' threatened to go beyond acceptable bounds.
During the drawn first Test at Lord's, India's Dinesh Karthik, while batting, was subjected to a stream of disparaging comments from Prior which led to a heated exchange between Vaughan and Sourav Ganguly.
"I don't know what was said between any of the players and umpires," Prior said of Sunday's incident.
But in an era of stump microphones, players' comments can be heard by fans inside and outside the ground, listening to radio and television commentary, as never before.
Former India skipper Ganguly was equally adamant that nothing exceptional had happened.
"I didn't get an opportunity to ask him. Sreesanth got out and we all went into the field immediately.
"These things happen. There was a bit of noise at Lord's and now there's a similar situation at Trent Bridge. That's become a part and parcel of modern sport... I've not heard anything unpleasant or rude."