The United States has for weeks been calling on partners in the 65-member coalition bombing the IS group in Iraq and Syria to contribute more, and last month Defense Secretary Ashton Carter chastised some countries for doing "nothing at all."
Saudi Arabia has been part of the coalition since late 2014. Though it carried out high-profile initial air strikes against the jihadists in Syria, its participation and that of other Gulf members dropped as they shifted focus to striking conflict-torn Yemen.
"There will be continued discussions with the Saudis and our other partners on the best ways we can continue to intensify coalition efforts."
Carter is meeting with defense officials from Saudi Arabia and at least two dozen other coalition members next week in Brussels, where he is expected to outline the next steps in the anti-IS campaign.
The Pentagon chief said Saudi Arabia had offered to help encourage other "Muslim-majority" countries to play more of a role as well.