Question: Somebody comes for 'Umrah in the months of Hajj like Dhul-Qa'dah, then he goes out of Makkah to Madeenah and stays there until the time of Hajj. Is it obligatory upon him to perform Tamattu' or has he to choose any one of the three types of Hajj?
Response: There is no obligation upon him to perform Tamattu'. He may put on ihraam for another 'Umrah if he wishes, and becomes Mutamatti', according to those scholars who are of the opinion that the Tamattu' ends by travelling. He would be Mutamatti' by this new 'Umrah, and it would be obligatory upon him to sacrifice an animal, according to the opinion of all scholars. When he puts on ihraam for 'Umrah coming from Madeenah and afterwards he performs the rites of Hajj, he would become Mutamatti'. Otherwise, if he wishes, he may return from Madeenah for Hajj only. There is a point of dispute among the scholars, in such a case, as to whether he has to sacrifice an animal or not. The correct opinion is that he has to sacrifice an animal, as the travelling to Madeenah does not break his Tamattu', according to the most correct opinion.
Shaykh Ibn Baaz
Fataawa Muhimmah tata'allaq bil-Hajj wal-'Umrah - Page 14, Fatwa No.2