Porto - FC Porto come into the second leg of their Champions League last-16 tie with Swiss champions Basel on Tuesday with the upper hand but with serious concerns over the fitness of their leading scorer.
The Portuguese club have the edge in the tie after a 1-1 draw in Switzerland in the first leg last month but were dealt a potentially serious blow when Jackson Martinez came off with a thigh injury in Friday's 1-0 win at Braga that could keep him out for up to three weeks.
The Colombian star has scored 17 goals in the Portuguese league this season and six times on Porto's run in the Champions League, so it is little wonder that the Dragons are sweating on his fitness.