Preston North End have completed the signing of striker Stephen Elliott from Championship leaders Wolverhampton Wanderers, with PNE defender Matt Hill moving in the opposite direction.
Elliott joins the Lilywhites for an undisclosed fee and has penned a three-year deal at Deepdale.
Meanwhile Hill, 27, has joined Wanderers for an undisclosed fee after making over 100 appearances for the Lancashire outfit.
Preston manager Irvine has still not found the central defensive cover he had been looking for and will probably have to turn to the emergency loan market when that opens next week.
Striker Jon Parkin, who joined from Stoke on a temporary loan on Saturday just in time to play in the 2-1 win against Charlton, made the move permanent on Monday morning when he signed a three-year contract.
>>Preston North End 2 Charlton Athletic 1 - See match reportIrvine was delighted with the business he was able to do over the weekend, but he said: "I don't know yet if there will be any more, but we will keep trying.
"There are a couple of positions I would like to speak to the chairman about. To be fair, the chairman worked unbelievably hard on the Jon Parkin deal, so I owe him a lot of thanks for that."
Irvine admitted Parkin had been on his shopping list for some time but the deal had only become possible in the past few days.
"I have been trying to sign a big centre-forward since May," he said. "And I did get Jon in on the last weekend of the transfer window.
"It's madness. Everyone has been waiting and you will see a flurry of things now.
"Jon made a big difference to us on Saturday. Everyone could see the quality he has got.
"I have brought him here to help us continue to be a good footballing side, rather than for him to be a battering ram.
"He only got introduced to the lads as they were coming into the dressing room. Yet he fitted into the team very well."
Elliott watched from the Sir Tom Finney Stand as Preston beat Charlton to go second in the table on goal difference behind Wolves.
He has been on the transfer list at Molineux since May despite only having moved there a year ago from Sunderland.
>> All the latest transfer news on deadline day
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