Tommy Gemmill for Celtic in 1967, and Kenny Dalglish for Liverpool in 1978 (played for Celtic) immediately spring to mind. Anyone else?
Celtic and Liverpool have played each other officially six times Celtic have beaten Liverpool twice, and lost once, there have also been three tied games so the answer to your question is ONCE
boudewijn zenden Also Pepe Reina, Jari Litmanen
One of the players who played for both arsenal and Liverpool is Nikolas Anelka ( also played for chelsea , West Brom ) Another Player is Yossi Bennoyoun
Nicolas Anelka, Michael Owen
Nicolas anelka - arsenal, Chelsea, Liverpool, real Madrid Jermaine pennant arsenal, Liverpool, real zaragoza theres two ;)
Patrick Berger who is currently at Aston Villa used to play for Liverpool. Also Scott Carson is on loan at Aston Villa from Liverpool. peter Crouch. also Dean Saunders, Steve Staunton, Ray Houghton, Mark Walters collymore, baros, mark james?
brian oneill lubo moravcik Andreas thom paul Lambert Alan mcnally
Craig Bellamy has played in the Premiership for Coventry City, Newcastle United, Liverpool, Blackburn Rovers, West Ham United, and currently Manchester City. He has also played for Norwich City in the then 1st Division (now Championship) and Celtic (on loan from Newcastle). He also represents Wales in international football.
Steve McManaman, Michael owen, Fernando Morientes.Jerzy Dudek, Xabi Alonso and Alvaro Arbeloa
There is solid evidence that Liverpool were the first to sing "You'll Never Walk Alone" in the year 1963.See:Which_soccer_club_was_the_first_to_sing_You'll_Never_Walk_Alone
Lucas Lopez in 1965