Henrikh Mkhitaryan completed his move to the club on Tuesday - and was straight into action for training at London Colney.
The Armenian playmaker took part in an intense session ahead of our Carabao Cup semi-final second leg against Chelsea - although he is cup-tied for the match.
Our club photographer was at London Colney and sent back these pictures.
Once you've looked at then, you can find out how he will fit into the Arsenal team in a Breakdown special below:
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