Comcast Corp. is exploring tie-ups with other companies or private-equity investors that could provide additional cash as the cable giant pursues a costly acquisition of 21st Century Fox’s entertainment assets, according to people familiar with the situation.

Comcast, which is bidding for the coveted media assets against rival Walt Disney Co. , has no immediate plans to tap such funding sources, but it may look to do so should the bidding reach extremely high levels—in the $90 billion range or so, the people said.

A strategic investor could team up with Comcast, taking on the U.S. Fox assets that are in play—including the Twentieth Century Fox studio and regional sports networks—while leaving Comcast with international businesses such as European pay-TV giant Sky PLC and Star India.

It isn’t clear who potential strategic partners might be. Tech companies or traditional media outfits could be candidates, one of the people familiar with the situation said. Earlier talks between Comcast and Amazon.com Inc. ended without a partnership, The Wall Street Journal has reported.

Disney and Fox reached a $52.4 billion all-stock deal in December, which Comcast topped June 13 with a $65 billion all-cash offer. Disney took pole position once again last week, agreeing to a revised merger pact with a $71.3 billion price and a target of a 50% stock consideration.