At this morning's press meeting, the manager confirmed that there will be fresh faces amongst his squad in training over the next few days.
The manager is looking to strengthen his squad ahead of a crammed fixture schedule, which will see his team play 16 games in two months.
Cox said: "We're a little bit closer [to making signings] but with some of these deals it's a case of 'how long is a piece of string?' You think you're close and someone comes in at the last minute. We've spoken to a number of clubs, players and representatives but we're not at panic stations.
"This period will only count for permanent transfers, we can still take emergency loans after this and free transfers.
"We have a number of people who we will look at this week in training. Some are flying in and some were released by their respective clubs in this window.
"If you look at the amount of games we have coming up in a short space of time, it doesn't take a rocket scientist to realise that the whole squad will come into play. But, we have to make sure that we bring in the right players with the right mindset who will improve us."
Exodus Geohaghon could be back in contention for a place in the starting line up after suffering recently with a hamstring problem. The giant centre half played 45 minutes in last week's friendly win against Notts County and is set to train this morning. Fellow defender Ryan Tafazolli is expected to resume training today after a lengthy spell on the sidelines.
Meanwhile, midfielder Jamie Hand has extended his loan stay at Hayes & Yeading by a further month.