Harry Redknapp insists we'll have to be ready for a Peterborough side with nothing to lose in Saturday's FA Cup third round tie at the Lane.
The Posh travel to N17 sitting at the bottom of the Championship but no doubt buoyed by Monday's incredible comeback against Cardiff City when they trailed 4-0 at half-time only to score twice in injury time to earn a 4-4 draw.
"It won't be easy for us," said Harry. "Peterborough will relish it, they'll come and have a real go. People will expect us to walk all over them but it just doesn't work like that. We're expecting a tough game.
"They had a great result last weekend, to come back from 4-0 down. When you go in at half-time 4-0 down it's your worst nightmare. You are fearing six, seven, eight, anything. It just shows the character they must have in the team to come back from that. I'm sure Mark Cooper will be delighted with them."
Harry knows from recent experience how tough it can be to progress against Championship sides.
When he won the FA Cup with Portsmouth in 2008, he faced five Championship teams - Ipswich, Plymouth and Preston before beating United at Old Trafford, then West Brom and finally Cardiff City at Wembley.
"We scraped past Ipswich and Plymouth by the odd goal and then won 1-0 at Preston," he recalled. "We could have gone out that day. We got battered, David James saved a penalty with five minutes left and we then scored with the last kick of the game.
"We then beat United and then played Championship teams in the semi-final and final. They were all tough games and it will be the same against Peterborough.
"There are no easy games in the FA Cup, that's for sure."