Danny Cowley is gearing up for what is likely to be his busiest day since arriving at Pompey last March.
As well as leading his side into League One battle against Charlton, there are the closing stages of the January transfer window to negotiate.
Any deals would have to be completed a little over an hour after the final whistle sounds at Fratton Park.
But Cowley will only add players to the squad on deadline day if he feels it is in the best interests of the clubs.
The Blues boss said: “I’ll have to keep my phone in my pocket and you might see me using it in the dug-out during the game!
“We hope to have all our business done by then and are working hard to achieve what we’re looking for.
“They’ve got to be the right players and the right characters for the club. We have a clear recruitment strategy.
“I won’t make decisions that I don’t think are right for Pompey and I’m really pleased with what we’ve done up to this point.
“January is an incredibly busy month and there’s obviously a lot of games as well, so you have to try to navigate through.”
"I’ll have to keep my phone in my pocket and you might see me using it in the dug-out during the game!"
Charlton are currently down in 15th position, but former Pompey keeper Craig MacGillivray has impressed since making the switch last summer.
Cowley said: “They’re much changed from when we played them earlier in the season, with a new manager and different playing personnel.
“There is pace and power in their side and they also carry a real goal threat – they have recruited well in that area of the pitch.
“We anticipate a really tough challenge and we’ve stalled a bit after a 10-game unbeaten run in League One, so it’s important for us to put that right.
“Craig was great for us and I believe he had a brilliant time at Portsmouth Football Club. We have nothing but love for him.
“He rightly picked up the individual awards last season and we really enjoyed working with him. After Monday evening, we wish him well.”
Cowley has no fresh injury concerns ahead of facing the Addicks, while Ryan Tunnicliffe is nearing a return to fitness.
He said: “We’ve had a really good week of training and some of our players were also involved in a friendly match.
“Ryan is training back on the grass and so we’re hopeful that he’ll be available for us again imminently.”