Johnson accepts they do not have the numbers other teams may have but believes there is a greater team spirit in their smaller unit.
"We all know we need much more than our starting XI, I think we have some great players around the squad that know that," he said.
"With some clubs anyone who is not starting may get the hump, not train well and throw their toys out a bit.
"Whereas we have got good lads and good professionals around who people realise they have to wait their turn.
"But we have been using a few different formations so it gives a few people an opportunity to play and because everyone knows they are on the verge of playing it keeps the squad tighter together rather than having the same XI every single week."