Marquez was forced to sit out last weekend's Andalusian Grand Prix after breaking his arm in a violent crash in the closing stages of the season-opening Spanish GP.
It means the six-time premier class champion has no points so far, while Petronas SRT Yamaha rider Fabio Quartararo got his season off to a perfect start with a brace of Jerez wins.
Having only pulled out of the Andalusian GP after taking part in Saturday practice and the aborting a Q1 attempt, Marquez is expected to be back in action next time out at Brno.
Assuming that the Spaniard is close to full fitness for the Czech race, Ducati rider Dovizioso believes that Marquez still cannot be ruled out of contention, particularly as Yamaha has suffered two engine failures in the first two races alone.
Andrea Dovizioso, Ducati Team