Finland will be without experienced midfielders Jari Litmanen and Aki Riihilahti for their home Euro 2008 qualifying match against Armenia on November 15.
Long-time national team captain Litmanen, 35, has a thigh injury and will also have ankle surgery. He is expected to be out until mid-December. Kaiserslautern's Riihilahti re-injured his calf muscle last weekend.
Tottenham's Teemu Tainio might also miss the group A game in Helsinki, a Finnish Football Association spokesman said.
Coach Roy Hodgson will announce his squad on Thursday. After four games, Finland lie second behind Serbia in the group with eight points. Armenia have one point from three games.