McMullan has enjoyed 15 years of stellar success with the north Belfast Reds, a career encompassing 541 appearances and an impressive 102 goals.
Numerous trophies have been gleaned during that time, including back-to-back Irish Premiership titles in 2013 and ‘14.
McMullan – whose current contract expires this summer – is mulling over his future.
The versatile midfielder has hinted at possibly retiring next month, but could now be tempted to continue playing.
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“We will wait and see what happens,” the 34-year-old said.
“I had considered calling it a day, but people keep telling me I have more to offer. So you never know.”
Looking ahead to Monday night’s special testimonial game against Celtic, McMullan added: “It is fantastic to have this game. I am so grateful to everyone involved.
“It will hopefully be a great occasion.”