Tottenham striker Dane Scarlett impressed for Ipswich Town for their 2-2 draw with Birmingham City.
Scarlett was influential off the bench as Ipswich fought back from 2-0 down to earn a point.
Credit to all the subs who came on," said McKenna. That starts during the preparations and them having the right mentality when they know they aren't starting.
"We try and prepare what changes we might make if we're chasing the game or if we're seeing the game out. The boys all knew and were pretty comfortable with what slots they would come in to and they all had a really good impact.
Marcus [Harness] scoring two goals to back up his goal last week is fantastic for him. It's great again for the spirit in the group and the understanding that the challenge we're facing this year is going to take the whole squad."
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