Long enjoyed a six-year spell at the Madejski Stadium before securing his move to the Hawthorns last summer and although he still wants to be on the winning side against them when the two sides meet, he will be reserved in his celebrations due to his strong ties at the club.
"I still have a lot of friends there at the club, not just the players but the manager, staff and higher up," Long told the Birmingham Mail.
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"I made a lot of friends in my time there and it will be strange playing against the blue and whites.
"I'll still be doing my job, trying to get the winner and hopefully get West Brom the three points.
"It's about business as usual. I won't celebrate out of respect if I do score."
Long is keen to help the side get back to winning ways, even if it is at the expense of Reading, after last weekend's defeat to Fulham left some questioning whether the Baggies could sustain their good early-season form.
"Everyone was saying how well we were playing during the first three games but suddenly you have one bad performance and everyone's wondering whether it was all a fluke," added Long.
"We got off to a good start and there's no panic. You have bad days, like we did on Saturday, and it's about how you react to those days that counts.
"We've now got a point to prove and we're all looking forward to the weekend."