Two second half strikes from Nocerino and Ibrahimovic took Allegri's men top of Serie A, while the Bianconeri suffered their sixth straight defeat
Two second half strikes from Nocerino and Ibrahimovic gave AC Milan a 2-0 win over Siena at the San Siro on Saturday evening.
A sweetly struck opener from Nocerino gave Milan the lead on 54 minutes, and an Ibrahimovic penalty 10 minutes later confirmed the three points that take the Rossoneri top of Serie A.
Fresh off the back of a disappointing 2-2 draw with Bologna last Sunday, and clearly eager to make amends, it was Milan who started the brighter of the two sides; Boateng and Ibrahimovic, in particular, looked liveliest within the opening few minutes.
Although it was all Milan throughout the opening exchanges, the first real chance of the game fell to Siena. Reginaldo cut inside from the left wing, and spanked a shot past Marco Amelia, only to see his effort go agonizingly wide of the post.
It was soon becoming clear that Siena were happy for Allegri's side to dominate possession, and then catch the Rossoneri on the break. And that was very much the case on 23 minutes as Francesco Bolzoni found himself free inside the Milan box after a swift breakaway, and flicked the ball past the onrushing Amelia, but also inches past the post.
That was to be the best chance of the half, as both sides went into the break level, Giuseppe Sannino and his men nullifying Milan perfectly.
The second period initially looked to play out in exactly the same fashion as the first: Milan dominating possession, and Siena replying with quick counter-attacks. But whereas in the first 45, Milan was unable to fashion a truly exceptional goalscoring opportunity, early in the second they did.
On 54 minutes Antonio Nocerino received the ball off Robinho on the edge of the area, and smashed the ball low into the bottom right-hand corner to leave Brkic rooted to the spot and make it 1-0.
With Siena desperate to equalize, it was Milan's turn to hit them on the counterattack. With Boateng soon bearing down on goal, Brkic came out to stop a shot, but tripped the former Tottenham man and conceded a penalty.
It was Ibrahimovic who took responsibility for the spot-kick, and smashed it low into the bottom left-hand corner of the net to double the hosts' lead.
Pato almost made it three with 15 minutes to go, but his shot was blocked on the line, and from there the game fizzled out. Depending on results later on this weekend, Milan could go into its next game away to Cagliari on Tuesday atop the table, whilst Siena hosts Fiorentina still in a relegation dogfight.