The Hoops boss believes he will never find a bigger club than Celtic, but admitted that he may eventually move on further down the line.
"There are not many bigger clubs than Celtic," he told talkSPORT. "I'm ambitious but at the moment I'm happy and have a lot to do. The challenges keep coming along.
"One day [if someone offers me a job] you always want to better yourself. I'm not talking about in terms of a club, because I'll never get a bigger club than Celtic.
"For the time being I just want to enjoy my time at Celtic."
Celtic clinched this season's Scottish Premiership title on Wednesday evening with a resounding 5-1 win over Partick Thistle.