The church said it is making 'all efforts to secure a safe release' of the priest kidnapped from Aden in March.
A video of Uzhunnalil had surfaced this week in which he made an appeal to the Indian government, Pope Francis and Bishop Paul Hinder, to save his life.
"The features of the person speaking in the video bear a close likeness to Father Tom. However, the source of the video, the date of its creation and the circumstances under which it was recorded are unknown. Even though we have no information about Father Tom's present whereabouts, we have strong indications to believe that he is still alive," the vicariate said in a statement.
The church said it has made countless appeals from the highest levels to secure Uzhunnalil's release as well as made concrete efforts by way of working in close collaboration with both international and local diplomatic channels.
The bishop has led calls for prayer throughout the churches in the vicariate for Uzhunnalil. During the Christmas mass, the bishop and thousands gathered at the cathedral parish of St Joseph's Abu Dhabi to pray for the priest's safety.
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