Celtic boss Neil Lennon admits signing a central defender is his top transfer target for the new season.
The Northern Irishman has seen his rearguard depleted over the summer with the departures of Darren O'Dea, Glenn Loovens and Daniel Majstorovic.
And following a less-than-convincing tour of Germany, where Celtic drew one, lost one and won one, Lennon is aware of his side's deficiencies.
With a Champions League qualifier on the horizon, Lennon said: "We are going into a level where we need to be really well conditioned, particularly away from home.
"We are going to have to play strongly without the ball. Victor Wanyama can play at the back or in midfield, depending on the opposition, but we are still short of a centre-half.
"You can see that. If we get an injury to Thomas Rogne, Kelvin Wilson or Charlie Mulgrew - we only have three recognised central defenders - then obviously it is a priority to try to bring one in quickly."
Goals from Gary Hooper and Anthony Stokes saw the Hoops end their tour with a 2-1 win over Vfb Aalen, which followed a 1-0 defeat by Stuttgart Kickers and goalless draw with FC Augsburg.