All the Black Sticks players are in Auckland this weekend including goalkeeper Kyle Pontifex who did not play against Japan.
McLeod said he expected the Koreans to be much tougher.
"They have been in the top six for a long time and will be much more patterned in their play than the Japanese."
After the matches against Korea, New Zealand players will be restricted to mainly weekend camps until April 16 when 25 players will be centralised in Auckland.
Three weeks before the Sultan Azlan Shah tournament in May, McLeod will name an 18-strong squad which he says should be 85-90 per cent of the eventual Olympic team.
"We will then play three tests against Australia in Australia in late June after which we will name the 18 players who will go to Europe for final preparations," said McLeod.
"After matches against Belgium and Holland in Belgium and Spain and Germany at the Olympic venue, we will select the 16 for the Olympics."
NZ v Korea
(all Lloyd Elsmore Hockey Stadium)
Today: 1.30pm
Tomorrow: 1.30pm
Thursday: 6.30pm
February 11: 3pm
February 12: 3pm.