Arsenal have agreed a £900,000 fee with Hertha Berlin for teenage defender Omar Rekik.
The Bundesliga side confirmed the loan signing of Arsenal midfielder Matteo Guendouzi earlier on Monday.
And, as part of negotiations, the north London side have put a deal in place for Hertha's 18-year-old Dutch centre-back who was previously at Manchester City.
Rekik is still to have his medical ahead of completing the transfer. He will be part of Arsenal's U23 squad.
Guendouzi has become surplus to requirements under Mikel Arteta this season after questions were raised over his attitude.