TalkSport reports that the Blues are preparing a swoop for the highly-rated midfielder.
Chelsea signed Oriol Romeu from Barcelona in the summer and the youngster impressed when he made his first league start of the season against Wolves on Saturday.
Roberto is highly regarded at Barcelona, but could be available for around £5million.
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Chelsea have struggled to build momentum in the opening stages of the campaign and are currently looking over their shoulders at the relegation zone.
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