Frank was pleased to see goalkeeper Alvaro Fernandez keep a first clean sheet in the Premier League.
The summer signing was thrust into action at the end of October when first-choice stopper David Raya sustained a serious knee injury but played his part in the narrow victory with a fine first-half save from Salomon Rondon.
Frank said: “I'm very pleased for Alvaro. We know goalkeeper is a crucial position in any team and we miss one of the best in the division so it is big shoes to step into.
“Naturally he is growing into the role and he pulled off two big saves, one from Rondon's shot and then Alex Iwobi's chance. That was not a big chance but it went through a lot of bodies and it was very important."
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