By 1827 united European powers threatened to confront Mehmed Ali over Greece

Evidence

In 1827 developments finally soured and the Pasha had to reconsider seriously his position in the war. During the summer of that year it became clear that the European powers were united in granting the Greeks their independence from the Porte and that his involvement in the Greek campaign might lead to a head-on confrontation with Europe. He increasingly found himself (in the words of the British Consul-General) “in a very difficult position. Much was expected from him by the Porte at the same time that he was anxious not to do anything contrary to the wishes of the British and French governments.” — Khaled Fahmy, All the Pasha_s Men_ Mehmed Ali, his…, 236