Casey Stoner has no plans to step in as a replacement for injured Pramac Ducati rider Danilo Petrucci.

Speaking after rain brought an early end to Monday's opening night of Ducati's private Qatar test, the retired double world champion said:

"There's no truth in that [rumours of replacing Petrucci]. Honestly my biggest goal at the moment is to get some tests out of the way and improve the bike for the Ducati riders, and hope to help make them even more competitive than in race one.

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"That is the most important thing. So no, we have no thoughts of wild-cards or replacements. Just because it's a similar situation to last year [when Stoner offered to replace injured Repsol Honda rider Dani Pedrosa], I'm not approaching it in any way the same."

Between the showers, Stoner was able to make a brief debut on the 2016 Ducati, having only used the GP15 during his previous test at Sepang. Steady rain then arrived, bringing the Monday action to an end. The Australian will be back on track on Tuesday.

"We've struggled all evening with the weather. It starts raining just enough to upset the test, then you come in and it stops! I think we got two or three laps with no rain at all.

"We wanted to get a comparison between the GP15 and [2016] Desmosedici this evening, to understand the differences. I had one out-in lap and got to feel a little bit. I'm looking forward to getting some laps on it tomorrow, if it's dry."

Petrucci required surgery for multiple right hand fractures after a testing fall at Phillip Island. The stress of riding during practice for round one then caused the fractures to re-open and he could be sidelined until round five at Le Mans.

Ducati test rider Michele Pirro is now the clear favourite to replace Petrucci until his return.