The Holland defender is in his third season at Arsenal after his arrival from Ajax.
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While his deal runs to 2028, Berta is eager to extend and raise terms for Timber as a reward for his improving status, says The Sun.
Timber is now regarded as first-choice right-back for manager Mikel Arteta and also has proven his versatility when filling in at centre-half.
Berta is driving the negotiations and is hopeful of reaching an agreement in the coming weeks.
