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.
The Spain Under-21 international has made 90 appearances for Valencia and was a regular last season, playing the full match in 37 of the club's 38 La Liga games.
Arsenal confirmed the news in a 52-second social media video, which saw Mosquera say: 'It means a lot to me. I'm joining a historic, massive club. When the coach and sporting director show that belief in you, it really helped convince me to come here.
'When you arrive here with your family, you really feel the greatness of this place. I'm thrilled to be here.'
The Gunners had already signed Martin Zubimendi, Noni Madueke, Christian Norgaard and Kepa Arrizabalaga this summer.
Their main target, though, is Viktor Gyokeres, with his arrival set to be confirmed soon.
More to follow.