David Ornstein claims that a £34 million deal, plus £4.3 million in add-ons, was reached by Arsenal.
Timber, 22, played in 47 games last year and has won two Dutch league championships.
Although he can also play right back, he is likely to team up with William Saliba in Arsenal’s back four.
Arteta will bring in Timber as his second significant acquisition of the summer after spending £65 million on Kai Havertz from Chelsea.

They are also preparing to reveal Declan Rice’s club-record deal to West Ham.

A £105 million deal has been reached between the two London parties, and an announcement is soon to come. When Rice and Timber arrive at the Emirates, Arteta’s spending will reach £200 MILLION.

However, they are also preparing to bid farewell to a number of first-team talents.
Granit Xhaka, a midfielder, is getting closer to joining Bayer Leverkusen, while Thomas Partey, a midfield partner, has been linked to Saudi Arabia.

Only six months after signing from Chelsea, Jorginho might return to Italy, and Newcastle is interested in Kieran Tierney.

And after his contract expired, Ainsley Maitland-Niles left on a free transfer.