Chairman Cliff Brown said: "We have done very well this season with a squad Mark has helped to assemble and with the existing coaching and back room staff.
"We believe Mark will offer continuity at a key time and enable us to build on the past two-and-a-half years.
"Mark's coaching credentials are without question, he is highly qualified to deal with both professionals and our young players.
"Mark has a commitment to blooding young players into the first team and to the academy and that remains important for the club's development.
"Mark has done an exceptional job as sporting director since taking that role 30 months ago and we are happy he can step into this new role seamlessly.
"We believe it will help the players and staff to work with someone they know and respect and we look forward to continuing success for Brentford Football Club."
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