The "Sign of the Times" singer says he won't be putting any pressure on them to make sure he is chosen for the role, reported Contactmusic.
Asked about the possibility of being a godparent to the baby, whose name has not yet been revealed, Harry says, "I think it's a roll of the dice, there are a lot of people Liam has in mind.
"I'm not going to add any extra pressure. If it came my way I would be honoured."
"I spoke to Liam and he's loving it. He said it's going really well and everyone's great. So I'm very happy for him.
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