During SARS-CoV-2 pandemic, oncologists manage patients at higher risk of having a severe course of this infection. This raises new questions about their correct management, as well as the difficulty of distinguishing tumor/treatments complications from those related to Coronavirus disease 2019 (COVID-19). We report a case of an 11 year-old boy undergoing treatment for T cell lymphoblastic lymphoma who experienced a prolonged SARS-CoV-2 infection. Oncological therapy was continued without significant changes compared to the initially planned treatment. No relevant complications occurred. COVID-19 convalescent plasma (CP) was administered, resulting in a positive antibody titer after 24 days.