Porto midfielder Marko Grujic admits there's disappointment seeing Luis Diaz leave for Liverpool.
Grujic made the move in the opposite direction last year.
After victory over Maritimo, Grujic said: "It's more complicated that way, we saw some news today, one of our best players left.
"Some things took our concentration, but we managed it and now we have to keep working.
"We have to keep scoring points. We won again today."
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