The England and Wales Cricket Board is investigating "a breach of team protocols" following the first Test against New Zealand.
England captain Ben Stokes and bowler Gus Atkinson "were present at a nightclub in the early hours of Monday when an incident took place", a statement from the ECB said.
It continued: "We are currently seeking further information, and an announcement regarding the squad for the second Test will be made in due course.
"The Cricket Regulator has been informed and we will provide a further update when possible."
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England, playing their first Test since losing the Ashes, had wrapped up a 115-run win over the Black Caps at Lord's on Sunday.
Stokes, 35, helped steer his team to victory despite complaining about the standard of the Lord's pitch.
England will resume their Test series against New Zealand on 17 June.
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