Giovanni Trapattoni has several options to call upon to play alongside the record goalscorer for the clash with the world champions
Tellingly, Giovanni Trapattoni used all five striking options against Slaven Bilic's side but not one of them managed to find the target with an effort on goal.
Robbie Keane, captain, talisman and record goalscorer is assured of his place in the lineup but following another blank from Kevin Doyle, the other slot seems to be up for grabs.
Trapattoni and his assistant Marco Tardelli have intimated that there will be changes up front for the Spain game on Thursday with Doyle set for the axe.
Ireland's hopes of qualification from Group C hang by a thread and they need to avoid defeat against the reigning European and world champions.
It's the question that he has been troubling the nation since Sunday night. Just who should partner Keane up front?
The West Brom frontman has become a real favourite of Trapattoni and has scored three goals from 13 caps. Was introduced as a left-sided midfielder against Croatia but his natural position is at the front.
Endured a dismal season at club level but the fog has not lifted since linking up with the Ireland squad. Never short on endeavour, but Doyle simply does not carry a threat on current form. Has only scored twice for Ireland in the last two years - both against Andorra.
Had an injury-disrupted campaign for West Brom but still managed eight Premier League goals, including strikes against Manchester United, Chelsea, Arsenal and Newcastle. Seems to be towards the back of the pecking order for Trapattoni but can trouble teams with his pace, strength and eye for goal.
The Stoke forward is a nightmare to deal with when on form and works tirelessly in the channels, creating chances for his team-mates. He is adept in front of goal himself, however, and scored seven times in the Premier League last term. Opened his Ireland account against Estonia.