Pompey saw their winning run come to a halt with defeat against Charlton at Fratton Park on Saturday.
But Kenny Jackett has urged his side to brush off that disappointment ahead of a midweek visit to Lincoln.
The hosts got the current campaign off to a blistering start, only to surrender top spot by narrowly losing to Doncaster at the weekend.
Jackett, therefore, expects them to provide Pompey with a tough test as both clubs look for a return to winning ways.
The Blues boss said: “There can’t be any Charlton hangover at Lincoln and we need to be ready, so we can do everything can to get a good result.
“They recruited well in the summer and have a balanced group – it’s traditionally a difficult place to visit on a Tuesday night.
"They’ll be playing with plenty of confidence and I’m sure it will be tough, but we want to bounce back after the disappointment of Saturday."
“It’s minus a crowd, though, and we’ve seen at Fratton Park the differences that can make. It does even things up a bit.
“They’ll be playing with plenty of confidence and I’m sure it will be tough, but we want to bounce back after the disappointment of Saturday.
“We were on a great run before that and Charlton proved a tough nut to crack – we had plenty of the ball, but couldn’t break them down.
“Lincoln also lost a close game against Doncaster at the weekend, but they made a great start to the season and will be keen to maintain the pace.
“We’ve got 17 points from the first 10 games and we would have liked a few more, but we’re not far away from where we want to be.”
Pompey will be without the injured Jack Whatmough at Sincil Bank, with Rasmus Nicolaisen set to deputise.
Jackett said: “We think that Jack will be out for around three weeks with a hamstring problem, which is a shame because he’s been playing well.
“Rasmus has come here to play and he’s had a good settling in period, with some games and substitute appearances.
“We’re excited about him coming into our team and, with Jack getting injured, it’s certainly an opportunity for him.”