NYON, Switzerland (AP) — The prospect of old friends and foes meeting again has added even more interest to Friday's blockbuster Champions league semifinals draw.

Every potential pairing of Barcelona, Bayern Munich, Juventus and Real Madrid — sharing 21 European Cup or Champions League titles, and 16 runner-up finishes — is loaded with history.

Still, two possible storylines stand out.

Bayern coach Pep Guardiola could face former team Barcelona for the first time since leaving in 2012 after a trophy-laden four-year spell included two Champions League titles.

A Barca-Juve pairing would reunite Luis Suarez and Giorgio Chiellini for the first time since the Uruguay forward bit the Italy defender in a World Cup match last June.

First-leg matches are played May 5-6. Return matches are May 12-13.

The final is June 6 in Berlin.

Copyright 2015 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.