Some Real Madrid fans have taken to social media to express their concerns over David Alaba starting for Los Blancos against Liverpool in the UEFA Champions League.Carlo Ancelotti's side are set to lock horns with the Premier League giants in the Champions League final tonight. The two sides will face each other with the hope of being crowned the champions of Europe at the Stade de France.With less than two hours to go until kick-off, Real Madrid have announced the starting XI for the match. Ancelotti has made one change to the team that made a stunning comeback to beat Manchester City in the semi-finals earlier this month.The Italian tactician has chosen Alaba as the centre-back pairing for Eder Militao today. The Austria international was an unused substitute in Los Blancos' 3-1 win against Manchester City at the Santiago Bernabeu, but has replaced Nacho Fernandez in the team this time. A section of Real Madrid fans are not happy with Ancelotti's decision to start Alaba over Nacho. Supporters have expressed their frustration with the 29-year-old's inclusion in the team on Twitter. Here are some of the best Tweets on the subject:Real Madrid C.F. 🇬🇧🇺🇸@realmadriden Our #UCLfinal 𝗦𝗧𝗔𝗥𝗧𝗜𝗡𝗚 𝗫𝗜! #APorLa14182153146📋✅ Our #UCLfinal 𝗦𝗧𝗔𝗥𝗧𝗜𝗡𝗚 𝗫𝗜! #APorLa14 https://t.co/uj9fib8ZoZSalau Abiola@SalauAbiola6@hamzkid0011 @realmadriden Alaba is scary the way they pass through him against Man City@hamzkid0011 @realmadriden Alaba is scary the way they pass through him against Man CitySam Waja@Sam_Waja@realmadriden Nacho out for Alaba ??Things might leak at the back@realmadriden Nacho out for Alaba ??Things might leak at the backYour Village People ⭐⭐⭐@youngestoldman4@realmadriden Alaba, you better behave tonight!! Man hasn't been that convincing2@realmadriden Alaba, you better behave tonight!! Man hasn't been that convincingOne Real Madrid fan wrote on Twitter:"Alaba shouldn't play as a starter, I have doubts about his fitness, I'm not optimistic."‏‎‎ABDULMAJEED@abood_salihb@realmadriden Alaba shouldn't play as starter, I have doubts about his fitness, I'm not optimistic@realmadriden Alaba shouldn't play as starter, I have doubts about his fitness, I'm not optimistic壁寒@runo18Alaba as CB? Conceding in the first half is now guaranteed. twitter.com/realmadriden/s…Real Madrid C.F. 🇬🇧🇺🇸@realmadriden Our #UCLfinal 𝗦𝗧𝗔𝗥𝗧𝗜𝗡𝗚 𝗫𝗜! #APorLa14193453280📋✅ Our #UCLfinal 𝗦𝗧𝗔𝗥𝗧𝗜𝗡𝗚 𝗫𝗜! #APorLa14 https://t.co/uj9fib8ZoZAlaba as CB? Conceding in the first half is now guaranteed. twitter.com/realmadriden/s…Haktan@ReadTGreAlaba playing we are cooked twitter.com/realmadriden/s…Real Madrid C.F. 🇬🇧🇺🇸@realmadriden Our #UCLfinal 𝗦𝗧𝗔𝗥𝗧𝗜𝗡𝗚 𝗫𝗜! #APorLa1423321📋✅ Our #UCLfinal 𝗦𝗧𝗔𝗥𝗧𝗜𝗡𝗚 𝗫𝗜! #APorLa14 https://t.co/uj9fib8ZoZAlaba playing we are cooked twitter.com/realmadriden/s…It now remains to be seen if Alaba can prove his doubters wrong by producing a good performance against Liverpool.How has Alaba fared for Real Madrid ahead of Liverpool clash?Los Blancos signed Alaba from Bundesliga champions Bayern Munich on a free transfer last summer. The Austrian has since been a regular for Ancelotti's side.Alaba has made 45 appearances across all competitions for the Spanish giants this season. He has scored three goals and provided four assists in the process.The defender has helped Ancelotti's side win the La Liga title and the Spanish Super Cup. It remains to be seen if he can help them win another trophy tonight.