What should happen if a player claims an injury when summoned for national duty?

When a player claims an injury while summoned for national duty, the appropriate action is for the federation to require a medical examination. This process is crucial because it ensures that the player's injury claim is substantiated with professional medical evidence. By doing so, the federation can verify whether the player is genuinely unfit to participate or if they might be contesting the call-up for other reasons.

Requiring a medical examination balances the interests of the national team and the player. It respects the player's health while also protecting the integrity of national fixtures by ensuring every player called is genuinely unable to play due to injury. This helps maintain a level of accountability on both sides and ensures that selections are fair and based on actual capability.

The other choices involve misunderstandings about protocols in sports federations. Automatically exempting a player or disqualifying them from future selections does not allow for proper assessment of the player's health status. Meanwhile, leaving the decision about a player's availability solely to the club undermines the authority of the national federation in overseeing player commitments to the national team. Thus, the most logical and fair course of action is to mandate a medical examination to evaluate the injury claim.