Guidolin was sent off during Udinese's last Serie A game at Napoli - his second dismissal of the season - but his club contested the suspension and he has now got away with only a fine.
Guidolin will not be able to count on striker Muriel for a while yet though, even though the player said he would be "back within a fortnight".
The coveted Colombian forward has been sidelined since early September with a hip injury and Udinese's club doctor Claudio Rigo has dampened his enthusiasm by saying he will have to be a little more patient yet.
"You can understand Muriel's hope, but I don't know where he has got this information from," said Rigo to the Gazzetta dello Sport.
"His recovery will take as long as we said it would when the problem arose.
"I understand his impatience, but not even if he started training now, would he be ready to play again within three weeks because in cases like this, the whole preparation needs to be done again.
"Clearly he has such high hopes because he is pain free, but if he started working again now and felt something, then we would be back to square on again.
"We need to take things slowly."
Pescara have made a slow start to life in Serie A, but their coach Giovanni Stroppa is convinced they are good enough to stay up.
"We are still a bit behind other sides, but I never said that we are not on a par with our rivals," he said.
"In fact, I think that we will stay up and we will stay up by a long way, I am convinced of this."