Kenny Jackett wants to see Pompey’s side settle quickly so they can return to winning ways.
A three-match losing run in the league was brought to an end by a 1-1 draw at home to fellow promotion chasers Doncaster.
Mallik Wilks capitalised on some poor defending to give the visitors the lead with their first serious chance of the contest, just after Jack Whatmough had gone off injured.
But Omar Bogle – handed a first start after netting at Luton on his debut earlier in the week – netted following the interval to ensure it finished all square.
James Vaughan, Lloyd Isgrove and Viv Solomon-Otabor also arrived before the transfer window closed and Jackett is hopeful that they will soon hit their stride.
The Blues boss said: “It does end our losing run in the league and we have to make sure that, with new lads coming in, we’re as cohesive and efficient as we were in the first half of the season.
“We had a very consistent side for a long time and we’re now waiting for things to settle – the quicker we do that, the better.
"We have to make sure that, with new lads coming in, we’re as cohesive and efficient as we were in the first half of the season."
“We had the best of the first half-hour and applied a lot of pressure, but a changeover in defence has cost us.
“There was a bit of confusion there – which shouldn’t happen – and Wilks has gone clear to put Doncaster 1-0 up.
“Again we put a lot of pressure on them right the way through the second half and there were key chances without us being able to add to Bogle’s effort.
“Omar’s calf cramped up quite badly before he came off, but two goals in two games is a great start and should encourage him.
“Our opponents were always a threat on the break and ultimately for all the territorial advantage we had – which was considerable – we couldn’t turn it into the win.”
Whatmough will have a scan on his injury, while Dion Donohue failed to return for the start of the second half.
Jackett explained: “Jack felt his knee, which isn’t good. It was bad enough for him to put his hand up and want to come off straight away.
“It’s frustrating, but it is the side that he’s had problems with before and we just hope it’s not too serious.
“There was quite a hefty tackle on Dion and there was a big cut on his shin, but hopefully that’s all it was and he’ll be okay.”