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Emlyn Begley
BBC Sport

England right-back Trent Alexander-Arnold made his La Liga debut as Real Madrid earned a narrow win against Osasuna.

The summer signing from Liverpool had played five times for his new club at the Fifa Club World Cup, where they reached the semi-finals, under new boss Xabi Alonso.

But this was his Bernabeu bow and he received a standing ovation when he was replaced by Dani Carvajal in the 68th minute.

Kylian Mbappe scored the only goal from the penalty spot as Real won their opening league game of the season in Alonso's first domestic match in charge. The France international sent goalkeeper Sergio Herrera the wrong way after he had been fouled in the box.

Madrid, who finished second last season under Carlo Ancelotti, were dominant and could have scored more.

Defenders Dean Huijsen - also making his La Liga bow after a summer move from Bournemouth - and Eder Militao forced saves from Sergio Herrera from long range.

There were also debuts for £43m former Benfica left-back Alvaro Carreras and teenage midfielder Franco Mastantuono, a £38.5m recruit from River Plate.

Osasuna had Abel Bretones sent off in injury time for catching Goncalo Garcia.

Kylian Mbappe has now scored 10 goals in his last six La Liga matches.

Kylian Mbappe's penalty, which he won himself, is the difference as Real Madrid make a winning start to their La Liga campaign.

It's a deserved three points for Xabi Alonso's side against an Osasuna outfit that offered so little, although they nearly snatched an undeserved point late on only for Ante Budimir to head over the top.

Osasuna's Abel Bretones raises an arm and pushes a forearm in the direction of Real Madrid Gonzalo Garcia, who indicates he has taken a shot to the face.

Referee Adrian Cordero issues a red card and Bretones is off.

Dani Ceballos comes on for Arda Guler as the television cameras again focus on Rodrygo, sitting among the Real Madrid substitutes, chewing his gum, looking annoyed at not getting on.

Five minutes of injury time.

A shot from Franco Mastantuono for Real Madrid and he tries to beat Sergio Herrera at his near post, but the goalkeeper has his angles spot on and can save the effort with it bouncing off his chest.

Osasuna launch a free-kick into the box, it is headed on and Ante Budimir, under pressure, has a chance but can only nod the ball just over the bar. A rare chance for the visitors. This one's not done yet.

Another change for Real Madrid as Vinicius Jr, who has been very handy tonight, comes off for Gonzalo Garcia, a player who scored four goals at the Club World Cup in the United States in the summer.

Garcia moves on to the left wing, while winger Rodrygo, the subject of lots of transfer speculation, remains unused so far and still one of the substitutes.

Will we see Rodrygo make a move to the Premier League in the next two weeks? The window closes on 1 September.

Just as in the first half, we have had a cooling break after 30 minutes of the half, with both teams having a mini team talk. Can Osasuna, who have offered so little going forwards, snatch a draw from this one?

Almost an instant impact from teenager Franco Mastantuono. Vinicius Jr gets to the byline and puts in a cross and the Argentine almost gets to head at goal, only for Lucas Torro to do superbly to get to the ball first and head it away for a corner.

Trent Alexander-Arnold's La Liga debut ends at the 68-minute mark, replaced by club captain Dani Carvajal.

Eighteen-year-old Argentina international midfielder Franco Mastantuono is also on, replacing Brahim Diaz.

Some great skill from Kylian Mbappe gets him away from three Osasuna players, as the Bernabeu roars its approval.

Osasuna need to do something and look to Victor Munoz to make a difference as he replaces attacking midfielder Ruben Garcia.

A chance for Osasuna as the ball goes over the head of Trent Alexander-Arnold and Abel Bretones has the ball only for him to be closed down by Eder Militao and the opportunity comes to nothing.

So close to a second. It is a lovely strike from Arda Guler 22 yards out and Sergio Herrera flings himself across the goal, only for the ball to zip just over the bar.

Kylian Mbappe creates another chance with some fine skill down the right wing, only for Aurelien Tchouameni's effort to be charged down. Real Madrid looking to finish this one off.

Real Madrid have now scored in 17 successive La Liga games.

Meanwhile, Osasuna have failed to win any of their last 38 matches when conceding first in the Primera Division, since a victory over Elche on 8 April, 2023.