The 34-year-old's tackle in last weekend's 5-0 defeat put the England Under-21 international out of the game and saw him sidelined for a month with ankle ligament damage.
However, referee Andre Marriner did not even book Davies for the offence and Coyle, who at some point every season seems to have to defend his frontman, said that should have been the end of the matter.
Davies has since spoken to Cleverley but the striker's wife Emma has been the subject of abuse on Twitter in the last few days.
"The bottom line is Kevin Davies made a challenge on Tom Cleverly which was a foul. That is all it was," said the Bolton boss.
"The boy picked up an injury and I think he is out for four weeks but it happens up and down the country every week.
"Last year at Old Trafford Stuart Holden was injured (rupturing knee ligaments) and he has been out ever since.
"I don't recall us making any fuss about the challenge. It was a red card for Jonny Evans.
"At the end of the day, Kevin made a challenge and the referee awarded a free-kick. That was it.
"The lad was unfortunate and we wish him a speedy recovery because he is an outstanding young player and he will go on and have a glittering career - but that was it."
Davies is nearly always near the top of the list of players who commit the most fouls.
This season he is joint-third with 11 in four matches but Coyle insists that is down to competitiveness and nothing else.
"There is no malice in Kevin Davies. He is a strong physical player but he never went to hurt the lad," added the Wanderers manager.
"Injuries happen to every team, not just the elite. You have to move on and you know when the game is played at such a pace there will be challenges.
"As long as nothing is malicious in intent that will be the nature of the game.
"If there is anything other than that then of course we have to stamp it out and make sure it is sorted. But anyone who saw it knows it was a challenge in which the lad just picked up an injury.
"I don't really know what else there is to say about it."
Coyle has had his fair share of injury problems as Bolton boss.
Holden is finally nearing a long-awaited return but he lost both Lee Chung-yong and new signing Tyrone Mears to broken legs prior to the season kicking off, with several other players yet to reach full fitness.
"We've had some terrible luck with injuries - we had two broken legs in pre-season and we had (Marcos) Alonso having a broken foot," he said.
"You want your best players available but Lee Chung-yong is out for the season, but Tyrone Mears we hope will be back at the turn of the year.
"Ricardo Gardner (groin) is back in light training and hopefully we'll get him a reserve game next week and he can start to step up."