Pierre-Emerick Aubameyang today completed his £56million transfer to Arsenal, which will trigger moves for Olivier Giroud and Michy Batshuayi on the final day of the transfer window.

The futures of the three strikers were all inter-connected and Batshuayi is now set to complete a loan move to Dortmund while Giroud will replace the Belgium international at Chelsea in an £18m move.

Batshuayi’s loan to Dortmund was key to the triple deal going ahead and sources in Germany claim that Arsenal had upped the original agreed price by another £1.3m in the past 24 hours.

That is the sum the Bundesliga club are suggesting Chelsea have demanded to take Batshuayi for the rest of the season, meaning they will effectively get him for nothing - apart from meeting his weekly salary.

Batshuayi is travelling to Germany this morning for a medical at Borussia Dortmund, who have been pushing Chelsea to agree an option to buy as part of the terms.

Standard Sport understands the Belgium international didn't report to the Chelsea team hotel ahead of the Bournemouth game as planned last night.

He was given the go-ahead by the club to make the move to Borussia Dortmund as they're on the verge of signing Giroud from Arsenal for £18m.

Giroud, who came on as a substitute in Arsenal's 3-1 defeat at Swansea last night, is believed to have already agreed personal terms on an 18 month contract with the option for another year.

The France international is 31-years-old and meant Chelsea were handed the same issue as they faced in their failed attempt to buy Roma's Edin Dzeko.

Chelsea brought in a policy in recent years which meant any player over 30 are given just 12 months contract extensions.

The move for Dzeko, who is also 31, collapsed because he wanted Chelsea to match the current length of his Roma deal, which expires in 2020, at the bare minimum and was pushing for a three-and-a-half deal.

But Giroud's agreement at Arsenal had only 18 months left to run, so Chelsea are ready to match that with the possibility of another year. They are also set to increase his current £90,000-a-week salary above £100,000-a-week.

Arsenal travelled back from their defeat in South Wales last night, arriving in London during the early hours of this morning.

The squad completed a light, post-match warm down session but Giroud was expected to be released in order for him to finalise personal terms over his move to Stamford Bridge.

Giroud is believed to have said his goodbyes after making his final appearance for the club.

Aubameyang is thought to have spent last night in a hotel near London Colney ahead of his club record move and was due to complete his medical this morning awaiting the green light from Dortmund to complete his transfer.

The club gave a huge indication that the switch will go through as planned by accidentally broadcasting an interview with Wenger last night confirming the Gabon international's arrival on their website.

Wenger said: "Yes it's good news. We need people who can give us more offensive power. We aren't efficient enough going forward.

"I'm convinced he will bring us that. He has a big challenge in front of him, he wants to win the Premier League."

Arsenal have monitored West Brom defender Jonny Evans throughout this month but, barring a late collapse in the asking price, were now expected to revisit the situation in the summer given the Midlands club are demanding £25m for the centre-back.

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Instead, the Gunners will turn their immediate attentions to tying Mesut Ozil down to a new contract.

Standard Sport revealed last week that Arsenal were hopeful the signing of both Aubameyang and Henrikh Mkhitaryan, who made his debut last night, would convince Ozil his future lies in north London and there continues to be positive dialogue between the two parties over extending the 29-year-old's existing deal, which expires in the summer.

As revealed on Friday, Chelsea initially only wanted Giroud on loan but the offer was rejected by the north London club.

Negotiations with Arsenal over a permanent deal stepped up yesterday, but with Wenger reluctant to sell to a rival, Chelsea coach Antonio Conte has been preparing for the possibility of Batshuayi staying.

He has been training with the Belgian up front throughout his preparations for the match against Bournemouth this evening.

Conte also admitted in his pre-match press conference that he had spoken with Batshuayi to make sure the forward was in the right frame of mind to face Eddie Howe's side.

But Chelsea will now go into the match without a recognised striker because Alvaro Morata is also ruled out with a back problem.

Conte could play a 3-5-2 formation with Eden Hazard and Pedro up front or bring Ross Barkley in for his first start to use the 3-4-3 system.

Meanwhile, Chelsea completed the signing of Roma left wing back Emerson Palmieri last night for an initial £17.5m with a potential £7.9m in add-ons.

The 23-year-old agreed a four-and-a-half year contract worth £42,000-a-week nine days ago but it was held up due to the negotiations over Dzeko.