"In view of the impact he's made, it's difficult to think of another cricketer who has achieved or done more for one county.
"His legacy extends beyond the playing arena, as I'm sure all that have been graced by his presence will agree. He is simply a great man."
Mushtaq said: "I feel that I could possibly play one more year but, out of respect, I would only do that if I felt 100%.
"I am going to miss playing for the club greatly. I am truly honoured to have spent six wonderful years here.
"There are not enough words to express my gratitude to the club, but I would like to specially thank Peter Moores, [present coach] Mark Robinson, Chris Adams, all my team-mates, all the fans and everyone who is part of this magnificent family for all the opportunities and memories that they have provided me with."
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