Just a month ago, the Czech striker Alvaro Morta wore a despondent expression and seemed to lack self-belief.
He was unreliable with his back to the goal and the ball at his feet, but it seemed that the preference of Chelsea, Eden Hazzard, and Villan and Pedro preferred to work with Olivier's steady, less flammable figure as a target man in the front.
There have been media speculation that Leslie, unsure whether she can keep her English title challenge title with a non-goalcoring center ahead, will be unloading a morta in the January transfer window.
The change has been unusual in the past four weeks.
Morta looked sharp, busy and hungry on Sunday when he took his numbers to four goals in four league games, one more than in his previous games in the competition, with two goals in a 3-1 victory over Chelsea on Crystal Palace.
"I'm really very happy for Alvaro," said manager Lesi Mauricio Sari. "He improved in the past month with confidence and personality, and he improved from a tactical and technical point of view."
Sari thinks Morta finally shows the way she persuaded Chelsea to pay a record fee of 60 million pounds ($ 78 million) to lure the Spanish striker out of Real Madrid 18 months ago.
"He may be the Supreme Pioneer," said Sari. "He has great physical and technical potential, he can get better, sometimes he's a bit fragile."
Also, it seems that Haard is pleased with Mourtah's awakening. Belgium made a big smile when he hugged his teammate after taking a free kick that led to Morta's second goal against a palace.
Morta almost ended in three goals but could not lift the ball over the goalkeeper Wayne Hennessy when he went to clear through the closing stages.
"I could get a hat trick, so it was not the perfect day," said Morta. "I'm getting better and I want to continue helping my team win. It's very hard because the Premier League is the most competitive league in the world. When you have a tough time, it takes a lot of time to recover, but now I'm good and it's nice to be scoring."
Former Manchester City manager Mark Hughes knew his Southampton team was in serious trouble at Itahad Stadium, when the two smallest players of the opposition were going out on air battles to attack areas.
"When you have David Silva and Rheim Sterling winning prizes in your box, it can not happen," Hughes said after Southampton was crushed 6-1 by the City League leader.
"When I saw that I thought, 'Come on, we have to be more aggressive, more determined, in our defensive play.' It was frustration for me that we talked long before the game about what we were going to do, but very quickly our game plan came out the window.
"A city asks other questions about you, they keep knocking on your door and they pick you up, you can come here and put them all behind the ball and try to see 90 minutes, but I've done it before and still have blows."
It was the 12th time that City has scored five or more league goals since Pep Guardiola took over as manager 2 1/2 years ago. No other team achieved the feat more than six times at the time.
Sergio Aguero became the ninth player to score 150 goals in the Premier League when he netted against Southampton. It came in his appearance 217 and only Alan Shearer, in 212 games, reached a milestone in less games.
The other eight earned 150 Premier League goals: Shirer (260 goals), Wayne Rooney (208), Andy Cole (187), Frank Lampard (177), Thierry Henry (175), Robbie Fowler (163) (162) and Michael Owen (150).
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