Due to their injuries, Porte and Rojas failed to continue with the 156.5-kilometer stage, which featured difficult sections of uneven cobblestone roads, reports Efe.
While the cyclists' injuries have yet to be confirmed, Porte complained of pain in his right collarbone.
Porte was ranked 10th in the general classification, 57 seconds behind his Belgian teammate Greg Van Avermaet, who is currently wearing the leader's yellow jersey.
The ninth stage of the 105th edition of the 2018 Tour de France is between Arras and Roubaix in northern France, near the border with Belgium.
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