The imminent exit of the Brazilian and the recent departure of Giovani dos Santos to Spurs means Barcelona will be short of options on the left flank, but Guardiola said a bid for Ronaldo was out of the question.
"I wouldn't make space for him in the team, even though I think he is a very good player," said Guardiola.
"We will look at the possibility of bringing in a winger, but if we don't that's fine. The priority is a number nine, we need one to complement Henry and Bojan [Krkic]. I want the three to feel like first-team starters."
Guardiola, 37, won six league titles in 11 seasons as a midfielder with Barcelona but has never held a senior coaching position.
Barcelona finished third in La Liga last season and were knocked out of the Champions League at the semi-final stage during a trophy-less campaign.
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