Anderson had to leave the field after James Fuller's drive hit him on the inside of his knee during Lancashire's four-wicket defeat by champions Hampshire in a One-Day Cup semi-final on Sunday, reports BBC Sport.
"It is a nasty blow in a painful area," said Chapple. "We don't know but we think that it will be a nasty bruise that will settle down in the next few days. The physio will see him in the morning and he walked off there."
Anderson, England's all-time leading wicket-taker in Test cricket, will now require further medical assessment on Monday.
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