Nagelsmann, whose sacking in March 2023 led to Tuchel's arrival, was tipped to return to Bayern, but has now extended his contract with Germany until 2026
Palacios sustained the injury in an aerial duel with Angel Romero in the first half of the contest at La Bombonera and was replaced by Giovani Lo Celso, who took the corner from which Nicolas Gonzalez headed home Argentina's equaliser.
The AFA did not specify how long Palacios would be out for, adding that the 22-year-old Bayer Leverkusen player's condition would be monitored in hospital.
"The player suffered direct trauma to the left paravertebral lumbar area, verifying a fracture of the transverse processes of the lumbar spine," the AFA said in a statement https://www.afa.com.ar/es/posts/parte-medico-de-exequiel-palacios.
Argentina are away to Peru next Tuesday while Paraguay host pointless Bolivia.