Couldn't really do much about the goal, although, if I was being super critical, I could make an argument that he should be more authoritative in his penalty area.
The sending off for Guendouzi means he'll miss Saturday's Premier League home match against Liverpool.
The 36-year-old began the season as first choice before he was injured in the win over Watford in September and replaced by summer-signing Leno.
"In each moment for each match, we are going to give the goalkeepers the opportunity to help us", Emery said.
Bellerin had confirmed his injury on Sunday through social media, though he did not detail how long he would be out, saying he was working to come back quickly.
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As well as being his first for the club, the goal also earned Lichtsteiner a minor record by making him the oldest Arsenal player (34 years, 288 days) to score in nearly 10 years.
Paudie O'Connor, who was later sent off, pulled one back for Blackpool in the 66th minute before the visitors looked to have found an equaliser as Cech was dispossessed by Jay Spearing inside his penalty area.
The Frenchman was renowned for playing youth in the competition, and despite getting to the final, was never able to lift the trophy.
Travelling to the Emirates Stadium for a Carabao Cup clash with Arsenal tonight, however severe the changes to Unai Emery's side, Blackpool knew they were in for a tough night.