Football League clubs had up to 5:00pm this Thursday to register an emergency loan deal before the loan period closed again until the start of January.
Parkinson admitted that some incomings and outgoings could have taken place yesterday (Thursday) if really necessary but, in the end, the City chief was more than happy to keep with what he has at the moment.
Parkinson said: "December is an important month and we're going to need everyone.
"The loan deadline came and went yesterday (Thursday) without any movement here.
"Myself, Julian (Rhodes) and Mark (Lawn) sat round a table before a previous loan window deadline to discuss plans going forward.
"We spoke about loan players and how, at times, those short-term loans can disrupt the balance of your squad and affect the spirit within the camp.
"We decided that we would only use it for what it is, which is an emergency loan window for emergency situations within your squad, such as lots of injuries.
"We decided, therefore, to stick with what we had. We did have a few calls about our players but we wanted to keep everyone together.
"I feel we go into Sunday's game in good shape and with the right numbers in the squad."