BAGHDAD, June 25 (Reuters) - Iraq will be compelled to consider all available options if its OPEC quota is not significantly increased, a senior Iraqi oil ministry official told Reuters on Thursday. Separate sources told Reuters Iraqi officials had considered leaving OPEC, but the current plan was to remain a member and seek a higher quota. The prospect of Iraq considering an exit from OPEC would be a further blow to the group after the departure of the United Arab Emirates this year.