The 66-year-old actor, who already has Taylor, 28, and Hayley, 25, with his ex-wife Pamela Bach, recently tied the knot with Roberts, reported Contactmusic.
"That's not really on the cards but it's up to Hayley. I think she realises what her sister is going through and how much of a responsibility it is," Hasselhoff said.
Hayley added: ''I don't feel broody. I never have done. I love my niece and nephew so much and I can give all my love to them. I love being with them but it's a huge responsibility and I don't think I'm ready for that. I travel all the time. I think parents are amazing, I didn't realise how hard it was until I saw my sister doing it.''
The couple is currently ''living out of a suitcase'' because of Hasselhoff's work commitments but are planning to buy a house in the UK.
''I'm looking forward to getting a place in the UK and enjoying the British countryside so Hayley can be close to her family. It'll be nice to get a house and get some sheep," the actor said.
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