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Arsenal fans on Twitter have reacted to news of Borussia Dortmund quickly concluding deals for Julian Brandt and Thorgan Hazard this week.

The Bundesliga runners-up splashed out a combined £45m to sign the two attackers after selling Christian Pulisic to Chelsea for £58m in a sustainable move that netted the club a profit while adding two players with clear talent.

The Gunners' plan for the summer window is still up in the air with the Europa League final on May 29 likely to go a long way in determining the club's finances. Arsenal are projected to have a slender budget of just £40m should they lose to Chelsea and miss out on Champions League football.

Dortmund's speed and efficiency this summer has already caught the eye, including amongst Arsenal fans on Twitter. Some believe their own club will never operate in the market with such smoothness, while others have called for the north London outfit to follow Dortmund's lead.

Check out the best of the reaction below!