The Gunners managed to complete a comeback victory to go with their remarkable 3-3 draw at Bournemouth earlier in the week, a game in which Giroud also scored a late, vital goal.
Wenger had also made his countryman captain for the trip to Deepdale. "He has scored many many goals recently. I think in the squad everybody contributes and it is not just 11," he explained.
"At the moment he is in good form and in the last month he has scored goal after goal so I named him captain as I like to rotate it a bit."
Wenger demands more FA Cup success
The Frenchman elaborated on his captaincy choice some more, saying: "He went through a period where he was in discomfort as he didn't play and during this period, which was quite long, he kept his focus and worked so I thought he has shown leadership qualities, which is why I made him captain."
There was also good news for another Arsenal forward, Danny Welbeck, who returned as a late substitute, his first competitive football in eight months after recovering from a knee ligament injury.
"It is a great moment as he has been out for such a long time, just for him to get 15 minutes was great," said Wenger. "I had a hesitation but he thought he had 20 minutes in his legs and in the end he nearly scored so that is good."
But the victory disguised a dreadful first half showing from Wenger's side who were fortunate to only trail to a Callum Robinson goal at the interval.
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An equaliser from Aaron Ramsey within a minute of the restart was the beginning of a vastly-improved second half showing from the Premier League side.
"Yes, I was angry," said Wenger of his half-time reaction. "We are top-level Premier League and we were dominated in the first half. Preston had chances and we were just not at the pace of the game that the game demanded."
The Gunners boss, however, felt that a comeback was always on the card due to his charges' newfound ability of never giving up.
"You do not want to have that kind of performance but this team responds when they are in trouble," said Wenger. "Since the start of the season we have had many many many comebacks and many goals in the final minutes."
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Ramsey's first goal of the season was another boost for Wenger.
"We spoke about that many times, getting in dangerous situations," said the manager of Ramsey's superb strike for the equaliser. "One of his qualities is getting in dangerous situations and sometimes he felt he lost a bit of confidence to finish. But hopefully this goal will give him the confidence."
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