Not much was expected in the transfer window for Unai Emery and Arsenal.
There were reports that Emery only had £45m to spend and didn't have the budget for any high profile signings.
But how wrong those reports turned out to be.
Gabriel Martinelli signed for £6m and was later followed by William Saliba (£27m) and Dani Ceballos (loan).
Arsenal then managed to shock everyone by completing an incredible £72 million move for Lille's Nicolas Pepe.
He wasn't the end of Arsenal's summer spending, though.
The Gunners have been looking to sign Kieran Tierney for some time but were struggling to meet Celtic's valuation of the left-back.
But a breakthrough was made on Wednesday night when it was reported that a £25 million fee had been agreed.
He travelled to London on Thursday and now the move has been completed, with Tierney signing a five-year deal.
While he's proven himself as one of the best players in the Scottish Premier League, a concern is Tierney's injury history.
The 22-year-old struggled with numerous injuries last season.
He's had three separate hip problems, while he was also forced to undergo groin surgery.
That means he missed 37 Celtic games last season and has been limited to just nine appearances in 2019.
But if he is able to stay injury-free, he would be a very good addition to an Arsenal squad that looks well equipped to challenge for a top four spot this summer.
Arsenal are also set to complete the shock signing of David Luiz.
Laurent Koscielny left the club earlier this week, meaning Arsenal needed an experienced player to replace him.
They agreed a £8m fee with Chelsea for Luiz earlier this morning and he is also expected to put pen to paper later today.
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