The Israeli has been integral to the recent surge up the table from The Seagulls.
Celtic have seen plenty of changes over the past 12 months. With the switch in manager some players were always going to fall by the wayside.
One such player was Israeli international Beram Kayal. The combative midfielder was a regular in the Celtic first-team during his first three seasons at the club under Lennon, after joining from Maccabi Haifa in 2010.
His playing time diminished last season and under Deila he became a relative ghost. With his contract expiring, they cashed in. Kayal joined Brighton and Hove Albion of the Championship for what the BBC said was an undisclosed fee.
Since his arrival The Seagulls, who were in the relegation mark upon his arrival, have soared. Brighton defeated Blackburn Rovers yesterday to go ten points clear of relegation.
Kayal has played in 11 games since his arrival, scoring on debut against Nottingham Forest.
But he has admitted he struggled to cope with the physical demands of the Championship.
"After playing ten games and playing every week I'm feeling good and feeling sharp. Sometimes I feel a little bit tired because playing Saturday and Tuesday isn't easy when you're playing three games a week.
“But the medical team help me recover well so that I can be ready for the next game, so I feel sharp and strong and ready to go again."
But he suffered from injury problems during his time at the club. He suffered an ankle injury in a tackle with Lee McCulloch of Rangers in 2011 which blighted him throughout his Parkhead stay.
So there is little surprise he has struggled to cope with the new demands.
Although that is certainly not showing on the pitch, where he has demonstrated his excellent ability on a regular basis. Celtic may not be missing him, but Brighton are sure pleased to have him.