Celtic manager Gordon Strachan was pleased to come away from Inverness with all three points given he was missing three forwards.
Strachan was forced to start with Shaun Maloney and Scott McDonald up front in Saturday's Clydesdale Bank Premier League clash following injuries to Jan Vennegoor of Hesselink, Georgios Samaras and Chris Killen.
"I thought it was a poor game in the first half and it only got slightly better in the second," he said. "We said to the players at half-time that we were looking for an improvement and we changed the style a wee bit."
He added: "We had to change our whole style of play before the game after we learnt we had another player (Georgios Samaras) injured.
"We tried something in the first half but it didn't work for various reasons so we changed it and it got a bit better."
Inverness manager Craig Brewster was annoyed with his side's slow start to the second half, with Scott Brown netting the opener three minutes after the restart.
The Caley Thistle defence then gave Glenn Loovens space in the box to head home his second goal for Celtic.
Brewster said: "I just felt the start of the second half we were a bit slow to react to things and came out of the blocks a bit slowly. We got punished and the second goal killed us off a bit.
"We have to deal with a cross coming into the box like that."
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