Now the young Hoops hero hopes he can provide another key contribution in tomorrow's crunch Group H tie against Dutch cracks Ajax.
Forrest confirmed he is getting back to his very best with a wonder solo goal to give Celtic a share of the points against Hibs at the weekend.
This came after an intensive 10-day rehab programme he followed while most of his team-mates were away on international duty.
The 22-year-old worked hard to regain the weight and strength lost when he was floored by a virus which ruled him out of the opening group game away to AC Milan in the San Siro.
He only returned in time to come on as a late sub against Barcelona on matchday two, and was powerless to prevent the Hoops suffering another defeat to leave them bottom of the section.
That's a situation he is determined will be rectified tomorrow, in the first of the double-header against Ajax.
Forrest knows the threat the Dutch champions will bring to Glasgow, having been on the end of a 4-0 thumping in a pre-season game in Amsterdam 15 months ago when Frank de Boer was shaping this side.
"They were very good," recalled Forrest, whose pace is a weapon Neil Lennon believes can hurt the Dutch side.
"They will have a lot of quick players, and they need the points, too, so they will be attacking.
"These games are different class, and all the boys say they are frightening.
"We want to give the fans back something for the support they give us."
A win tomorrow would set Celtic up perfectly for the next game, in Amsterdam in a fortnight, where Lennon has made it clear he believes they can take points.
But Forrest insisted: "We're not thinking about the second game, just about tomorrow.
"We have to give our all in this one. The other match will take care of itself after that.
"We need to get three points, and we've got players to do it. Let's hope we do."
Meanwhile, Hibs boss Pat Fenlon has praised Forrest for his fine finish on Saturday.
The Irishman said: "We had a warning before the goal because Forrest had given us a few problems in the game.
"We tried to get the message across to send him down the line and defend crosses rather than let him come inside.
"But in fairness to the kid, it was a fantastic finish, he came inside and put in the far side."