"There is a concern. I think if you look at attendances around the world, in test cricket they're on the decline and it's probably only in England that we sell out most days for test matches," the 34-year-old told Sky Sports on Wednesday.
"Obviously, it's great to see Twenty20 the way it is, drawing crowds and getting young kids into the sport, but there are still a lot of players out there who want to play test cricket and see it as the pinnacle.
"In the future, it's something that has got to be looked at," he added.
Anderson, recovering from a shoulder injury, is set to join Lancashire on the county circuit for the next three months before England host the first test against South Africa in July.
(Reporting by Aditi Prakash in Bengaluru; editing by Ken Ferris)
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