Rangers manager Mark Warburton has told The Glasgow Evening Times that he had to make sure his signings have the necessary 'strength of character'.
Warburton takes his Rangers side to face Morton today, and will be hoping for a major response from his squad after their first defeat of the campaign in midweek.
Rangers had won all 11 competitive games under Warburton, before facing Scottish Premiership side St. Johnstone in the Scottish League Cup - a match which they lost 3-1.
A response is needed from Rangers today, and the squad need to show the mental strength to come back from a defeat to get another league win today.
That ability to be mentally strong is something that Warburton has highlighted in his transfer policy, as he spoke to the Glasgow Evening Times about the club's criteria for new signings.
Warburton claims that, given the huge pressure on players from the expectant Ibrox crowd - as well as difficult situations and pitches away from home - Warburton had to make sure that each of his signings had a key attribute: the ability to deal with pressure and those tough scenarios.
"When we were targeting the players we wanted to bring in during the summer we made sure we knew they had the strength of character to deal with the experience they would face up here," said Warburton. "You have to deal with it. Going to some of these places in January or February will be a tough test and if they are not up to it then we will be found out."
"If we are going to recruit players from down south, we have to make sure they can deal with the challenges of playing at Championship, which are different to those they face down south," he added.
Whatever Warburton's criteria was in the summer, it has worked. Players like James Tavernier, Andy Halliday, Jason Holt and Martyn Waghorn have all impressed for Rangers, but their mental fortitude will now be tested this afternoon as Rangers look to bounce back from that first defeat of the season.