Genoa earned a 1-0 friendly victory over fellow Serie A side Empoli with a Diego Perotti decider.
The Grifone emerged with the morale-boosting win, though the Tuscans had a stronger start with Eugenio Lamanna tested by Manuel Pucciarelli and a Massimo Maccarone header just wide.
Costa was unlucky not to open the scoring when his strike smacked against the base of the upright.
The goal arrived later, when Juraj Kucka was brought down for a penalty converted by Perotti.
Genoa earned a 1-0 friendly victory over fellow Serie A side Empoli with a Diego Perotti decider.
The Grifone emerged with the morale-boosting win, though the Tuscans had a stronger start with Eugenio Lamanna tested by Manuel Pucciarelli and a Massimo Maccarone header just wide.
Costa was unlucky not to open the scoring when his strike smacked against the base of the upright.
The goal arrived later, when Juraj Kucka was brought down for a penalty converted by Perotti.
Kucka was on fine form and a screamer whistled just over the bar from distance.
Empoli 0-1 Genoa
Scorers: Perotti pen 72 (G)
Empoli: Skorupski, Martinelli (Camporese 68), Mario Rui (Picchi 89), Tonelli (Bittante 58), Costa (Dermaku 78), Dioussé (Ronaldo 67), Maccarone (Piu 67), Zielinski (Signorelli 58), Pucciarelli, Saponara (Krunic 65), Croce (Brillante 78)
Genoa: Lamanna, De Maio, Izzo, Burdisso, Perotti (Ghiglione 74), Costa, Pandev (Gakpé 58), Lazovic (Ntcham 62), Kucka, Rincon, Cissokho (Marchese 58)