The Spain international thinks the former Santos man could make the difference at the Vicente Calderon and says Diego Costa's potential absence will be a blow for the RojiblancosXavi believes Neymar will play a big role in the second leg of Barcelona's Champions League quarter-final tie against Atletico Madrid.
The Brazil international netted the equaliser in last week's 1-1 draw at Camp Nou and Xavi has little doubt he will be equally important in Wednesday's return at the Vicente Calderon.
"Neymar feels important and makes a difference for us," the Spain international was quoted as saying by AS.
"He scored the equaliser in the first leg against Atletico and he will be important again in the return on Wednesday."
Diego Costa, however, is doubtful for the match at the Vicente Calderon after picking up a hamstring problem last week and Xavi believes the absence of the "vital" 25-year-old will hit Atleti hard.
"Diego Costa's vital for them," the World Cup winner stated. "He provokes fouls, makes centre-backs work hard, is quick and runs all game.
"He is key for them and his absence would be important."
Costa has netted 33 goals in 44 appearances in all competitions for the Rojiblancos this season.
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