Head to head
Atletico need to win three of their remaining four La Liga games to win the title for the first time since coach Diego Simeone played for the club 18 years ago.
Friday's hard-fought 2-0 win over Elche stretched their winning run to eight games in domestic competition and they have been similarly strong in Europe this season.
Atletico are undefeated in 10 Champions League games this campaign and have won all five at home.
Chelsea's title hopes look all but over after they lost a league game at home under Jose Mourinho for the first time in 78 matches as they were stunned 2-1 by bottom-placed Sunderland on Saturday.
The 2012 European champions have now lost four times in their last nine games in all competitions, but did manage a fine 2-0 win over Paris Saint-Germain in that run to book their place in the semi-finals for the seventh time in 10 years.
Diego Simeone (43)
Jose Mourinho (51)
LEADING SCORERS (In all competitions )
Diego Costa (35 goals)
Eden Hazard (17 goals)
First in La Liga with four games to go, four points ahead of Barcelona but having played one game more.
Second in the Premier League, five points behind leaders Liverpool with three games left.
ROUTE TO THE SEMI-FINALS
Winners of Group G ahead of Zenit St. Petersburg; beat AC Milan 5-1 on aggregate in last 16; beat Barcelona 2-1 on aggregate in quarter-finals.
Winners of Group E ahead of Schalke; beat Galatasaray 3-1 on aggregate in last 16; progressed on away goals against Paris Saint-Germain after scores tied at 3-3 in quarter-finals.
EUROPEAN CUP/CHAMPIONS LEAGUE BEST PERFORMANCES
- 9 Spanish league
- 10 Copa del Rey
- 2 Europa League
- 1 Cup Winners' Cup
- 1 Intercontinental Cup
- 4 EPL champions
- 7 FA Cup
- 4 League Cup
- 1 Europa League
- 2 Cup Winners' Cup
- 1 European Super Cup
The sides have met three times in all in European competitions with the spoils shared at a win for either side and a draw.
Atletico won the European Supercup in 2012 as a first-half Radamel Falcao hat-trick powered them to a 4-1 win in Monaco.
Chelsea had the upper hand when the sides met in the Group Stages in 2009, though, as after a 4-0 win for the hosts at Stamford Bridge, the English side sealed their passage into the last 16 with a 2-2 draw in Madrid.