"We've got a pretty good squad here and we've got what we think is a reasonable XI going out there tomorrow as well."
"The guys that played the other day did a fantastic job and certainly put pressure on the incumbents as well. We haven't battered down our test team just yet but we're not far away."
The third seamer option is the main talking point ahead of the first test as Bracewell attempts to play his way back into the test side after missing the home series against England with a foot injury.
Wagner took eight wickets in New Zealand's first warm-up win over Derbyshire, while Bracewell took seven.
Despite Wagner sitting out the the four-day match, McCullum but didn't rule the left-armer out of the first test.
"He's got a huge chance of playing at Lord's."
"He'll rest this game and we'll see how Doug goes. Either way I'm confident both of them can do a role and it will be more of a horses for courses approach versus obviously trying to favour one person," McCullum said.
"I know the guys who have come back into the mix, Guptill and Bracewell in particular, if they get the opportunity, I'm confident they'll do well. If not and we stick with the same XI then I'm confident those guys will do well to."
Black Caps side to play English Lions at Grace Road, Leicester.
Hamish Rutherford, Peter Fulton, Kane Williamson, Ross Taylor, Dean Brownlie, Brendon McCullum, BJ Watling, Bruce Martin, Tim Southee, Doug Bracewell, Trent Boult.
- nzherald.co.nz