Arsenal have confirmed their fifth signing of the summer, with Spain youth international Cristhian Mosquera arriving from Valencia.
As Mail Sport reported on Sunday, talks advanced over the weekend and the 21-year old had agreed personal terms with Arsenal.
He was expected to undergo a medical this week though the clubs had been ironing out the final details on a £13million fee with added bonus payments.
Arsenal have been looking to add a defender to compete with William Saliba and Gabriel Magalhaes.
Mosquera can play at both centre back and right back and will fill the gap in the squad left by the departure of Takehiro Tomiyasu, who mutually agreed to terminate his contract.