The Swedish striker has scored in four of his 18 Premier League appearances this season and has seven goals in all competitions under manager Mikel Arteta, who is yet to get the best out of the former Sporting Lisbon star.
The 27-year-old striker, who Arsenal signed for £64M, has bagged just five times in 17 league games after finding 39 goals in the Portuguese top flight last term.
Despite him struggling in North London, Rice has backed Gyokeres to prove that he is one of the best in the world and to show why so many top sides were desperate for his signature in the summer.
"It's tough for him, because he's got two defenders on him all game, all over him. So he has to use his strength, he has to do all he can to help the team and with my first goal, without him making that run from Gabriel Martinelli's flick and holding it, setting it off to Martin (Odegaard), that goal wouldn't happen.
“That was a pivotal moment in the game for us to turn the game on its head.
"I see how hard he hits a ball, and when that space arrives for him and the ball's arriving at his feet to score goals, he will 100% score. But at the minute, defenders in the Premier League want to be able to stop Viktor Gyokeres, because he's one of the best strikers in the world.
"Trust me, he's doing unbelievably for us, and we wouldn't be where we are without him."
Gyokeres will start once more against Liverpool on Thursday night as he tries to justify his price tag and find the back of the net once more to shrug off any doubters.