The management of the NFL’s Houston Texans has advised players not to leave their hotel in Mexico City or order room service ahead of their game on Monday night in the Aztec Stadium against the Oakland Raiders. The match is part of the NFL’s international series and will be the first NFL game played in Mexico City since 2005.

A section of the memo under the heading “Safety” had a bullet point with: “DO NOT leave the hotel.” It was followed by a line advising players to leave all “expensive jewelry at home,” not to bring large sums of money and not to use ATMs.

A second section entitled “Health and performance” offers basic tips such as drinking only bottled water and not putting ice in drinks. It also warned: “Eat all meals in the meal room. DO NOT order room service,” and: “DO NOT eat outside of the team meal room.”

The rule about room service could be related to a memo the NFL sent to its players earlier this year warning that some meat produced in China and Mexico may be contaminated with clenbuterol, a restricted steroid. Clenbuterol is banned in Mexico as a growth enhancer for cattle but is suspected to still be in use.

The Raiders did not receive such a memo, but several of its players have said they would not eat room service while in Mexico.

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