Marc-André ter Stegen, Barcelona's goalkeeper, arrived at the Joan Gamper sports city, amid uncertainty about his future.
Ter Stegen was supposed to move to Dutch side Ajax Amsterdam on loan in recent days.
But the negotiations have grown complicated more than once, as he continues training with Hans Flick and the Barcelona squad until the deal is completed.
Reports indicated a breakthrough in the deal in the last few hours.
At the same time, Ter Stegen joined the Barcelona delegation that departs for the United Kingdom in a few hours to begin its pre-season camp.
Ter Stegen played last season on loan with Girona.
The German goalkeeper lost his place at Barcelona to Joan Garcia and Wojciech Szczęsny.