Gundogan had told Sky Deutschland: "We were not courageous enough in the game and we made a lot of simple mistakes".
"Sometimes we have made decisions that are hard to understand but, because we won, everybody said we were geniuses".
But Guardiola said his side were strong despite the first leg setback.
Crystal Palace play in the Premier League against Manchester City on Sunday at Selhurst Park, with the London club looking to complete an unlikely double over their big-spending opponents.
But speaking before the game, Chelsea winger Eden Hazard has made it clear that the Blues are only focusing on the game and now what happens with the title challenge.
"Especially in the second half it was under control". We did not create too much but we were there.
USA enters 5G network race, jockeying for position with China On Friday, the United States FCC has announced that it will take a couple of measures to expedite the development of 5G in the US. The president boasted that by the end of the year, 92 markets in the US will support 5G compared to 48 in South Korea.
'We don't care about who can win the title, we'll go there and try to win the game, ' Hazard told the BBC (via Metro).
"Of course we want to do well, especially in the Champions League but in that case in this specific game I don't think I agree".
When these teams met earlier in the season, Chelsea recorded a 1-1 draw in the Premier League and a 2-1 win in the League Cup.
"For 20 months, we've been winning every three days; an incredible amount of games".
Then comes a midweek derby at Manchester United and a trip to Burnley before potentially two more Champions League games in the space of a week in the semi-finals. "We knew it from weeks ago, how it would be between these important games and Tottenham in the Champions League".