The Saints beat Collingwood by 28 points in their qualifying final yesterday to move into the preliminary final in a fortnight.

Geelong beat the Western Bulldogs by 14 points in the other qualifying final on Saturday.

Collingwood midfielder Pendlebury has a suspected broken leg and Rocca an ankle injury out of the St Kilda match.

Both will have scans today but look certain to miss the clash with Adelaide.

The winners of that match will play Geelong in the preliminary final.

Brisbane and the Bulldogs play in the other sudden-death semi on Friday night. The winners play St Kilda in a fortnight.

Guide to the second week of the AFL finals:

FRIDAY, SEPTEMBER 11

Second semi-final - WESTERN BULLDOGS v BRISBANE LIONS at MCG at 7.45pm (AEST)

At stake: Winner plays St Kilda in preliminary final in third week, loser is out

Head to head: Western Bulldogs 23 Brisbane Lions 16

Last time: Western Bulldogs 15.12 (102) bt Brisbane Lions 12.12 (84) at Gabba R20 2009

Head to head in finals: Brisbane Lions 2 Western Bulldogs 0

Last time in finals: Brisbane Lions 15.20 (110) bt Western Bulldogs 10.16 (76) at Gabba 2EF 2000

Summary: The Bulldogs were out-played but not disgraced against Geelong, but are injury free. The Lions will aim to build on the euphoria of Saturday night's comeback win over Carlton.

Key: The Lions are buoyant, but must travel and have the bigger injury worries. Can they continue the ride?

SATURDAY, SEPTEMBER 12

First semi-final - COLLINGWOOD v ADELAIDE at MCG at 7.30pm (AEST)

At stake: Winner plays Geelong in preliminary final in third week, loser is out

Head to head: Collingwood 20 Adelaide 11

Last time: Collingwood 13.11 (89) bt Adelaide 9.14 (68) at AAMI Stadium R19 2009

Head to head in finals: Collingwood 2 Adelaide 0

Last time in finals: Collingwood 19.11 (125) bt Adelaide 14.10 (94) at AAMI Stadium 1EF 2008

Summary: Adelaide obliterated Essendon, are in healthy shape and have kicked 53 goals in their past two games. The Magpies were off key against St Kilda, but did beat the Crows in a sudden-death final last year.

Key: Adelaide enjoyed a trouble-free final on Friday night and Collingwood were beaten on Sunday. How decisive will the Crows' extra rest be?