"I thought I held my run a bit, I thought I was onside but I obviously took a glance over to make sure and saw the flag was up," the 24-year-old told the British media.
"The replays suggest I was onside -- it should have stood -- but obviously the linesman thought it was offside," he added.
"At the end of the day we should have been 1-0 up.
"To look at a video for 20 seconds would have maybe changed the outcome of the game," the Wales international said.
"I think we could take a leaf out of rugby -- they do it really well. You see it on the screens, they go off for 20 seconds and they get the decision right in the end," Ramsey said.
Arsenal currently lie ninth in the table on four points and travel to St James' Park to take on Newcastle United on Saturday.
(Reporting by Simon Jennings in Bengaluru; editing by Amlan Chakraborty)
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