Cataldo, 29, turned professional with Liquigas in 2007 and joined Omega Pharma QuickStep in 2009. He won a stage in the 2012 Vuelta a Espana before his move to Team Sky, where he started four grand tours.
He won the Italian national time trial championships in 2012 and won the individual time trial in the Coppi-Bartali earlier this year.
“He will be a great gregario for Aru as well as Nibali, and plus on top of that he knows the ins and outs of doing a good TTT – make no mistake, Dario Cataldo is a very important addition for the team,” Alexandr Vinokurov said in a team press release.
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