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Chelsea matches where Alberto Undiano Mallenco was referee
| Date | Venue | Opponent | Score | Comp |
| 10/03/2009 | Stadio Olimpico, Turin | Juventus | 2-2 | UEFA Champions League |
| 06/04/2011 | Stamford Bridge | Manchester United | 0-1 | UEFA Champions League |
| 24/11/2015 | Sammy Ofer Stadium | Maccabi Tel Aviv | 4-0 | UEFA Champions League |
| 20/09/2018 | Toumba Stadium | PAOK Salonika | 1-0 | UEFA Europa League |