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The France international left the Gunners on deadline day as he searches for first-team football ahead of the World Cup.
Arsenal signing Pierre-Emerick Aubameyang ledo to Dortmund completing a deal for Michy Batshuayi which in turn meant Antonio Conte brought Giroud to Chelsea.
And the forward has opened up on just how many offers he had.
He told Telefoot: “I had an offer from Dortmund, but they wanted a loan. Sevilla were interested, Roma contacted my agent.
“But when Conte told me he was counting on me, my choice was made.”
“My choice was quite clear and obvious when I knew that Antonio Conte wanted to work with me”
Chelsea striker Olivier Giroud
Giroud said he has no hesitation in moving to Stamford Bridge.
He added: “My choice was quite clear and obvious when I knew that Antonio Conte wanted to work with me.
“I know that Conte appreciates my profile, we work well together.
“I spoke to [France manager] Didier Deschamps about my situation. He did not tell me to join Chelsea, just to change club.”
Giroud has started tonight’s clash against Watford in the Premier League on the bench.
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The striker added: "The fact is that the coach wanted to recruit a new forward striker [Aubameyang] With his signing at Arsenal, it was three top strikers, and that's why I decided to leave.
"I could have stayed, but I needed some solutions to get back in.
"I wanted to stay in the Premier League and Chelsea was a great opportunity for me."