The US Department of Justice is seeking more information on the deal as part of an informal investigation.
"It is not uncommon for the Department of Justice to make second requests in transactions of this kind," said a Kodak spokesman. "We remain confident that we will complete the transaction."
However, the firms are now talking about completing the deal in the summer rather than by the end of Q2.
Sources suggest that the sticking point in agreeing the deal relates to the US newspaper plate market, although Kodak wouldn't comment on the claims.
Former KPG chief executive Jeff Jacobson will head up the Graphic Solutions & Services (GS&S) division and act as GCG chief operating officer.
Story by Barney Cox
Have your say in the Printweek Poll
Related stories
Latest comments
"Thank you for the opportunity to comment on this Jo, and PrintWeek!
Please feel free to get in touch with the Howden Print Team to arrange your own Free of Charge Cyber Micro-Penetration Test to help..."
"I never quite understand the statements such as "achieved such a positive outcome for this well-established business".
The established business unfortunately failed and no longer exists, a..."
"Genuinely sorry to read this."
Up next...

Commitment, presence and energy will be much missed
Tributes paid to Lascelle Barrow

Around 300 roles may be affected
International Paper to close five UK packaging sites

Asset ownership delayed process
Reflections to be liquidated

'Start of a new era'