MILAN - Inter warmed up for Thursday's Coppa Italia Tim final return leg against Roma with a 1-1 Serie A draw with Siena at the Giuseppe Meazza.
Daniele Gastaldello rose to head home an equaliser in time added on after Julio Cruz had given Inter a second-half lead.
Roberto Mancini named a 4-3-3 for Inter's last home league match of the season, with Cameroonian youngster Maa Boumsong making his Serie A debut in midfield.
Julio Cruz had an early shot saved by Mirante before veteran striker Enrico Chiesa fired wide with just Julio Cesar to beat.
Chiesa was presented with a second opportunity before half time but failed to direct Paro's cross over the line at the back post.
Inter had three good chances before the break, with Cesar's diagonal shot cleared before good saves by Mirante from Kily Gonzalez and Maa Boumsong.
There was no change in the script at the start of the second half as Maa Boumsong had another low shot saved by Mirante, with Julio Cesar doing the same from Chiesa's first-time effort at the other end.
The Nerazzurri gradually imposed their game and broke the deadlock on 60 minutes when Cruz ran on to a Maa Boumsong through ball, picked his spot then fired first-time past Mirante to net his 14 Serie A goal of the season.
Three minutes after setting up Cruz's goal Maa Boumsong was replaced by Dejan Stankovic, who came on to complete a century of competitive appearances for the club.
Cesar and Martins both fired low shots inches wide as Inter edged close to a second goal.
Six minutes from time Mancini replaced Obafemi Martins with Swedish striker Goran Slakovski, who at the age of 17 years and 1 month becomes the youngest ever player to make his Inter debut. The record was previously held by Giuseppe Bergomi, who first pulled on a Nerazzurri shirt when he was 17 years and 2 months old.
In a dramatic finale Nicolas Burdisso was shown a straight red after an off-the-ball incident with Falsini before Gastaldello headed home a corner in stoppage time to force a draw.
INTER 1-1 SIENA (HT: 0-0)
Scorers: Cruz 60, Gastaldello 90+3
INTER: 12 Julio Cesar; 3 Burdisso, 2 Cordoba, 49 Andreolli, 33 Wome; 19 Cambiasso, 55 Maa Boumsong (5 Stankovic 63), 18 Kily Gonzalez; 30 Martins (89 Slavkovski 84), 9 Cruz (8 Pizarro 73), 31 Cesar
Subs not used: 1 Toldo, 13 Zè Maria, 16 Favalli, 23 Materazzi
Coach: Roberto Mancini
SIENA: 83 Mirante; 2 Negro, 90 Portanova, 46 Gastaldello, 3 Falsini; 75 Alberto (17 Packer 86), 19 Paro, 7 Tudor (18 Iadaresta 69), 6 Vergassola, 30 Molinaro; 10 Chiesa (16 Guzman 79)
Subs not used: 14 Fortin, 5 Colonnese, 66 Legrottaglie
Coach: Luigi De Canio
Referee: Andrea De Marco (Genoa)
Booked: Cruz 45, Paro 81, Vergassola 89
Sent off: Burdisso 90