The Spanish star is not hopeful of the Premier League champions retaining their title this season, and is instead switching his attention to winning the cup instead
The Citizens kept their fading Premier League title challenge alive this week with a 1-0 win at Aston Villa thanks to a Carlos Tevez goal.
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"The league is very difficult," Silva told The Daily Mail.
"But we can reach the cup final, so we have to focus on this game."
Silva has already won his fair share of high-profile cup competitions with Spain and former club Valencia. Although the 27-year-old was quick to point out that the FA Cup still holds some kind of magic, ousting its Spanish equivalent for excitement.
"The Copa del Rey is similar to the FA Cup but not as interesting," he explained.
"In England, smaller teams can get to the finals. On paper, Barnsley are a small team, but they are in the quarter-final because they deserve to be, so we will have to be very cautious."
"The nearest I came to playing in a giant-killing game in Spain was when I was at Valencia. We were a big team, but we won the cup and beat Barcelona, who were the biggest team. It’s another chance to get to Wembley and it is very important that we win this game."