Dunleavy said: "If there was contact between Bonzi and the official, I think it was accidental and done out of frustration. From the look on his face, he was really (surprised) that he got a technical."
Wells was suspended for one game without pay and fined $10,000 for intentionally striking and verbally abusing an official during Tuesday's 105-93 home loss to the Seattle SuperSonics.
The incident occured with 4:38 to play after Mike Dunleavy and Wells were ejected. Wells whipped his headband across the court at referee Tim Donaghy and knocked over a water cooler before leaving.
Dunleavy said: "If there was contact between Bonzi and the official, I think it was accidental and done out of frustration. From the look on his face, he was really (surprised) that he got a technical."
Wells was to serve his suspension on Thursday, when the Blazers hosted the Dallas Mavericks.
Rivers took exception to the officiating down the stretch in Wednesday's tough 88-86 loss to Utah.
He was fined $7,500 for confronting and verbally abusing an official while failing to leave the court in a timely manner.