Juan Foyth has only played seven first-team games for Estudiantes but is "feeling relaxed" about his team being in talks with Tottenham Hotspur.
After scoring 17 goals in River Plate's 2016-2017 Primera Division campaign, Sebastian Driussi has switched to Zenit for a reported €15 million $(22.5 million).
A busy start to the transfer window has continued at Roma, which has sold Leandro Paredes to Zenit for a minimum fee of €23 million $34.2 million).
Zenit completed the signing of Serbia international Branislav Ivanovic from Premier League club Chelsea.
Ivory Coast international Lacina Traore has left Monaco for CSKA Moscow on loan until the end of the 2016-2017 campaign.