Sources told ESPN on Thursday that Ronaldo was close to finalising an agreement with City after speaking to manager Pep Guardiola.
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He left Juve training earlier in the week with a suspected arm injury and sources at Juve confirmed to ESPN that Ronaldo did not take part in training on Friday.
City had made Tottenham Hotspur forward Harry Kane their No. 1 target this summer as they look to bring in a striker but after the England captain announced he was staying at Spurs, the Premier League champions turned their attentions to Ronaldo.
Ronaldo’s future has been the subject of speculation throughout the summer and the five-time Ballon d’Or winner hit out at the “disrespectful” transfer talk on Instagram.
In Italy, he won back-to-back Serie A titles in his first two seasons.
Should the 36-year-old complete a move to City, he would return to the Premier League for the first time since 2009 when he left rivals Manchester United, having won three titles and the Champions League.