The couple tied the knot in Italy last weekend and Timberlake's grandmother Sadie Boma says they are both too busy with their careers at present to even think about starting a family, reported Radar online.
"I don't think they will rush it. I'm not sure they can. They are both away so much that it would be hard to take care of a baby together and I know Justin would want to be there," she said.
However, Boma said when the time comes, Timberlake, 31, and Biel, 30, will be fantastic parents.
"Oh, Justin is going to be the best dad. That boy has always been so great with children, and I know Jessica will be a great mother."