The provided source material does not mention Gajanan Maharaj, so it cannot confirm what he may or may not have said. The text in Chapter 0 explicitly states that the saint who would become Sai Baba called himself a 'banda' (a servant of God) and would give blessings by saying 'Allah bhala karega' (God will do good). He never said 'Anal Haq' (I am God) but often uttered 'Yaade Haq' (I remember/meditate on God). All these details are attributed specifically to the figure known as Sai Baba, with no information available to make a connection to Gajanan Maharaj.
Did Gajanan Maharaj ever refer to himself as a 'banda' or say 'Allah bhala karega' like Sai Baba did?
📖 Chapter 0