The Brazilian striker is being hammered for his lack of goals this season.
But midfielder Ritchie told the Evening Chronicle: "All players can score goals on the pitch, it's not just down to Jo.
"We win and lose together as a team.
"We attack together and defend together - only you boys talk about indviiduals.
"It's not down to individuals at all, it's a collective thing."
He continued: "It's unfair to criticise any player. No player goes out not to score goals or not to do something.
"Joey works his socks off for the team."