Fulham midfielder Joao Palhinha suffered a shoulder injury in Fulham's entertaining 3-2 victory over Brentford in the Premier League Summer Series.
The in-demand Portugal international, playing at centre-back, was forced off after injuring his shoulder in an innocuous challenge with Yoane Wissa during the first half.
Fulham boss Marco Silva admitted the injury "doesn't look really nice" although said further assessments were needed. Palhinha was later seen with his arm in a sling.