Guilherme revealed that Santos' management attempted to negotiate his transfer without his or his agent's knowledge. There was even an exchange of contract drafts for a potential loan move. Guilherme was surprised by this as he had performed well in the previous season and was important for Santos' return to the top league. The arrival of Neymar and the support of coach Pedro Caixinha were crucial for his decision to stay at Santos.

Guilherme had a good season with 13 goals and 10 assists and may receive proposals.