He has also spent time on loan at Stoke, Leicester City, Blackpool and Brighton, as well as longer spells at Sheffield United and Derby.
McDermott feels Hendrie can fill the goal-scoring void left by Gylfi Sigurdsson who has joined Hoffenheim.
"Hendrie's best position is just off the striker. He's scored a lot of goals in his younger days for Aston Villa there," he said.
"He's a clever player with real ability - he is very fit and wants to be constantly involved in the game and will improve us as a team."
McDermott added that Hendrie has received a glowing reference from other Reading players.
"Brian Howard knows him really well, Andy Griffin knows him well and Ian Harte knows him well. They have all spoken really highly of him and hold him in very high regard.
"So I believe it'll be good to have him with us but we'll see him in training and go from there."
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