The pair were hurt during last night's 1-0 home victory against Chelsea FC. The 25-year-old Oliveira suffered the worse injury after falling awkwardly in a 25th-minute challenge with visiting defender Ricardo Carvalho. Scans today revealed a fractured kneecap while several internal ligaments were stretched in the collision.
Club medical officials are eager to run further tests once the swelling inside Oliveira's knee recedes. However, they have made a pessimistic forecast, expecting the Brazilian to be out for a minimum of four months.
Nano, also 25, had left the field just before Oliveira, and he too has suffered a knee injury with tests revealing sprained ligaments. His prognosis suggests at least a month on the sidelines. Betis, whose next Group G match is at Liverpool FC on 23 November, already have Miguel Ángel Lozano out with a long-term knee problem.
©UEFA.com 1998-2014. All rights reserved.