Rangers travel to Spain intent on making the semi-final stage of the Europa League by beating Athletic Bilbao.
The tie is level at 0-0 after the first leg at Ibrox last Thursday.
However, on top of progression in the competition, Europa League prize money is also up for grabs when Rangers compete in the Basque region later this week.
Rangers have already earned almost £13m from their performance and participation payments from UEFA in the Europa League this season.
However, they could surpass the £15m mark if they triumph over Bilbao on Thursday night with €4.2m per club paid to sides making it into the semi-final.
A further €7m is paid to sides reaching the final of the competition which will be played at the home of Athletic Bilbao, the San Mames stadium.
The winning club will receive €6m as a bonus along with Champions League qualification next season.
Read more:
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Rangers' Spanish struggles laid bare as Athletic Club Europa League test looms
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Watch the 'terrible' call Europa League ref made last time in charge of Rangers match
Rangers' guaranteed Europa League earnings so far
League phase participation - €4.31m (€4.14m down-payment and €170k balance).
Win bonuses (Malmo, FCSB, Nice, Union Saint-Gilloise) - €450k x 4 = €1.8m
Draw bonuses (Olympiacos, Tottenham) - €150k x 2 = €300k
Qualification to the round of 16 of the competition - €1.75m
League ranking bonus - €2.175m (clubs receive €75k for each position higher in table)
Top eight finish in league phase - €600k
Qualification for the round of 16: €1.75m per club
Qualification for the quarter-finals: €2.5m per club
GUARANTEED TOTAL: €15.185m (£12.74m)
Potential Europa League payments
1st to 8th in league phase - €600k (£500k)
9th to 16th in league phase - €300k (£250k)
At least €75k - increased by the same figure for every position above the bottom in the league phase.
- qualification for the knockout round play-offs: €300k per club - qualification for the round of 16: €1.75m per club - qualification for the quarter-finals: €2.5m per club - qualification for the semi-finals: €4.2m per club - qualification for the final: €7m per club The UEL winners can expect to receive an additional €6m
