Hertha Berlin chief Michael Preetz admits keeping hold of Matteo Guendouzi is no guarantee.
On a straight loan from Arsenal, Guendouzi is already a starter for Hertha coach Bruno Labbadia's first team.
Preetz stated to Kicker: "Three months ago, Matteo's loan signing wasn't possible, but it was at the beginning of October.
"We are happy that he is here and that he enriched our game from the start. We'll see everything else next summer.
"How the prices will develop by then and what Arsenal is planning then, nobody can say today."
