Celtic took on Rangers in the semi-finals of the Scottish League Cup at Hampden Park in Glasgow on February 1.
It proved to be an easy match for the Scottish Premiership champions, as they won it 2-0 without facing too much of a problem.
Leigh Griffiths put the Bhoys in the lead after just 10 minutes, and Kris Commons find home a second from 20 yards just past the half-hour mark.
It was the first Old Firm meeting since April 2012, and Lennon - who left Celtic after four years as a manager at the end of last season, has revealed what he told his successor Deila prior to the contest.
“Beating Rangers in the League Cup semi-final was another big moment for Ronny in terms of getting the fans behind him,” the former Nottingham Forest midfielder told The Sun.
“My advice beforehand was to just win it. In Old Firm games the result is everything. If you can also do it in style then great. But ultimately it’s about winning.”
Celtic went on to win the Scottish League Cup and the Scottish Premiership, as the Hoops proved that there is life after Lennon.
The Hoops could actually face Rangers on a regular basis from now on, as the Gers are in contention of gaining promotion to the Premiership.
Rangers defeated Hibernian 2-0 at Ibrox in Glasgow in the first leg of the playoff semi-final on Wednesday.
If Stuart McCall’s side progress to the playoff final, then they will face the 11th-placed Premiership team for a spot in the Scottish top flight next season.