It has been reported that Celtic have expressed their interest in securing the services of Maher on a free transfer this summer.
The Netherlands international joined AZ in the summer of 2018 on a one-year contract after leaving Dutch rivals FC Twente.
According to WhoScored, Maher made 21 starts and four substitute appearances in the Eredivisie for AZ this season, scoring one goal and providing four assists in the process.
AZ finished fourth in the Eredivise this season and could feature in the group stage of the Europa League during the 2019-20 campaign.
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