The ex-Bees winger is waiving part of a loyalty bonus he reportedly expected to receive, asking for it to be given to 100 club workers instead.
Brentford officials have praised the Algeria international for opting to reward staff who aided his two-year stint in the Championship.
Phil Giles, the Bees director of football said: "Saïd has been a brilliant player for Brentford over the past two-and a-bit seasons.
“Thomas and I told him exactly that when we met him on Wednesday morning.
“As part of that conversation, Saïd suggested, and we agreed, that some money should be used as a reward for club staff, many of whom have had a direct influence on Saïd's development during his time here and who have done a superb job in difficult circumstances in the last few months.
“We are happy with the agreement reached and this makes it a nice end to a good transfer window for the Club."