However, the move includes an obligatory purchase clause at the end of the season, with the Argentina international becoming a permanent Villa player next summer.

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The 22-year-old will sign a four-year contract next summer, with the reported fee set at £43m when he joins on a permanent basis.

It is a way around FFP regulations for all parties and will help fill the void at Villa Park left by Morgan Rogers, who moved in the opposite direction for a British transfer record of £117m.

He departs Stamford Bridge just one year after arriving from Manchester United in a £40m deal, scoring eight goals in 43 appearances in all competitions with the Blues.