The 42-year-old, who scored 72 goals in 273 games, was promoted from his coaching role with the club's under-18s to the first-team set-up and is relishing being alongside Martinez for the visit of West Ham.
"It will be an emotional time for me, I'm very proud," the Scot, who began his new role on Monday having initially rejoined the club in a coaching capacity in 2011, told evertontv.
"It's been fantastic. I've been coming up (to the first team) once or twice a week since the manager came in and he told me he'd like me to come up full-time and I'm delighted.
"I think the idea was to integrate me into the squad and it is a fantastic opportunity for myself.
"It is a great challenge. You are with the best of the best, this is the elite, the best players in the world and you have to make sure you do your job properly."
The former Scotland striker says he expects Everton to push hard to secure a top-four finish.
"We can push really hard for a European spot and the manager is emphasising that," he added.
"We can get some good rewards this year and we are still in the (FA) cup as well."