Cohen insisted at the Edinburgh International Television Festival that he was "really happy" with the current line-up of Jessie J, Tom Jones, will.i.am and Danny O'Donoghue.
"We thought they made a very big impact for a first series and we want them all to come back," said the channel head.
"We haven't signed any contracts yet, so I can't say anything official. But we said at the end of the first series that we wanted all of our coaches to come back."
Cohen also defended the show's ratings performance - calling The Voice UK a "big hit" - but admitted that the singing contest had experienced "a few problems" during live performances.
He added that a second series would definitely incorporate format changes, including "probably less live shows"
Jessie J recently confirmed that she will return to The Voice UK via her Twitter account.