The Portuguese international dominated the midfield after giving Portsmouth an early lead with a brilliantly-taken left-foot shot from 20 metres.

But Mendes was carried off after 43 minutes when City midfielder Joey Barton caught his Achilles tendon and was booked for the foul.

Mendes was knocked unconscious earlier in the season when Ben Thatcher caught him with a flying elbow that earned the-then City defender an eight-match ban from the English FA.

Thatcher joined Charlton Athletic last month.

Last March, Mendes scored two superb goals to give Pompey a 2-1 win over City that sparked a revival and helped the south-coast club escape relegation trouble.