Scott feels Grabban has been unsettled by interest from other clubs but will not lodge a complaint to the Football Association.
Grabban, 24, has bagged 16 goals for the Millers this season but went over two months without scoring prior to his equaliser in the midweek draw with Crewe Alexandra.
Speaking ahead of today’s home game with Plymouth Argyle, Scott said: “Coming to terms with what happens when there is speculation and offers is something that will make him a stronger person and a better player. Without question, it affected his performance.
“It hasn’t helped us but it’s not his fault,” he stressed. “There were extenuating circumstances with certain clubs getting involved in a more detailed way than they probably should have done. That happens in football.
“There are people involved that don’t necessarily follow the guidelines that are there and the right ways of doing things,” he said.
“We can’t control them, we can only deal with what we have put in front of us, and that’s what happens.
“If you tried to do something about it, it would take years and years and be a waste of time,” he said. “If someone wants to get involved with players they are going to do it by hook or by crook.
“It’s a nasty side of the game. Football is not a nice business to be in,” added Scott. “It’s a ruthless business and a business where people lose jobs or get promotion on what they do. Sometimes they take that to the nth degree. Whether that’s right or wrong, is anyone else’s opinion – but, when it affects your players, it’s not a nice thing.”
Grabban, who quit Brentford to join the Millers last summer, was the subject of a failed bid by rivals Crawley Town in January. He is celebrating fatherhood after his girlfriend gave birth last weekend.
“The concern about the baby and everything has now been lifted so he’s got a free mind to enjoy the rest of the season,” said Scott. “He’s committed to Rotherham United and a few games out of the side have rested him physically and mentally.”
Defender Johnny Mullins, meanwhile, has signed a new two-year deal with the Millers.