Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) said that the Prophet (peace and blessings be upon him) gave the one performing tamattu' Hajj a concession: "When he does not find a sacrificial animal and was also unable to fast beforehand, he may fast during the days of Tashriq."
Yahya bin Sallam narrated it thus, and he is not strong.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 8900