Argentina Under 20 international Leonardo Balerdi has completed a transfer to Borussia Dortmund, signing from Boca Juniors on a long-term contract.
Reports in Argentina have indicated Dortmund agreed to pay €15 million (£13m/$17m) for the defender, with a further €2m potentially due to Boca in add-ons.
The 19-year-old rose through the ranks at youth level with Boca before graduating to the senior team in 2018.
He has since appeared in five Argentine Primera Division matches, earning the attention of Bundesliga leaders Dortmund.
BVB have drafted Balerdi in as cover for Manuel Akanji, who is currently sidelined with injury, as they chase a first German title since 2012.