The 17-year-old winger only joined Ajax earlier this year from William II but has now moved to the Emirates where he will join the Professional Development Phase.
The club website issued a statement welcoming Idelho in which he is described as a player ‘best known for his pace and accuracy.’
The announcement came on Thursday, the day after Swedish striker Nikolaj Moller joined the club on a similar deal from Malmo.
Goal report that the 18-year-old forward has signed a four-year deal at the Emirates in a move costing the Gunners around £450,000.
Both Ideho and Moller will join Per Mertesacker’s Academy and work under Steve Bould in the Under-23s as they look to work their way towards the first team under Mikel Arteta.
‘We have been watching Thomas for a while, so we’re now delighted to add such a high quality player to our squad,’ said Arteta. ‘He is a dynamic midfielder with great energy. He brings a lot of experience from a top club that has competed at the highest level in La Liga and the Champions League for several years.
‘We’re very impressed with his attitude and his approach to the game. He’s an intelligent footballer and we’re looking forward to him integrating into our system and contributing to the progress we’re building at the moment at the club.’