The former English champions take on the Baggies this evening just four days before their FA Cup final against Wigan Athletic at Wembley.
Despite their intentions to secure second place in the league table, Mancini has revealed that it has been tough for his players to focus.
"It is difficult and [last weekend's Swansea City draw] was difficult as our concentration is on the final," Sporting Life quotes Mancini as saying. "But we need to play these games and for us it is important to win."
Meanwhile, City's FA Cup final opponents Wigan can move out of the bottom three this evening with a win over Swansea.