The Gunners fell five points adrift of Premier League leaders Manchester City after they were held 2-2 by Liverpool at the Emirates Stadium on Sunday, with the duo forced to withdraw in the second half.
Arteta will still be without captain Martin Odegaard and Riccardo Calafiori for the trip to Deepdale on Wednesday but Gabriel and Timber are likely to return soon than expected.
“We are still assessing him (Gabriel). It doesn't look bad at all. It was much better the next day. Hopefully he’ll be fine. He has done some tests," said Arteta.
“Jurrien was fine. He was very tired. He’s been out for a while and he could not continue the game. Not a new injury there at all.
"We have four very demanding matches now in all different competitions and we want to win them all.
"We have to start tomorrow to create good momentum again and we'll put a strong team out there."
Arteta handed goalkeeper Jack Porter, plus fellow teenagers Josh Nichols, Myles Lewis-Skelly and Ethan Nwaneri their full senior debuts in the 5-1 home win against Bolton in the previous round.
Two more teenagers, Maldini Kacurri and Ismeal Kabia, made their first appearances off the bench, but Arteta said the Carabao Cup remains a tournament he wants to win.
"It's important because it keeps everybody alive, you maintain the winning habit, which is really important," he said.
"You show that you care about the competition regardless of who you play, so you have to compete in every match.
"The margins are so small and tomorrow we're going to face a really tough opponent."
William Saliba is available after suspension and Arteta confirmed he will be making changes again at Preston as he utilises his full squad.
"There are players who haven't played that much and they will have their chance tomorrow, that's for sure," the Spaniard added.
"But you have to earn the right to play and when you have that right, you have to perform and perform in a way to impact the team to win the game.
"That's what we'll demand from everybody, whether you're young, experienced or playing regularly for us."
Preston upset Fulham in the previous round, holding their nerve to win a marathon penalty shoot-out 16-15 - a new tournament record - after a 1-1 draw.
Lilywhites boss Paul Heckingbottom said he wanted his players to enjoy the occasion.
"We know we'd have to give a great performance and be really strong, be clinical at one end and be really strong at the other end - similar to Fulham - then who knows what could happen."
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