Unbeaten title contenders Ajax succumb to an even unexpected as rare home loss at the hands of Utrecht, after conceding two early penalty goals and managing only a dying minutes come back goal.
Earlier that week: Ajax – Milan 1-1.
November 7th, 2010
Second league defeat for Ajax, at home again, against ADO this time. Regular Eredivisie followers will probably recall prolific winger Wesley Verhoek as the scorer of the only goal of the match.
Earlier that week: Auxerre – Ajax 2-1.
December 12th, 2010
Twente’s biggest loss of the season: the Oussama Assaidi show finishing in a 6-2 home win for Heerenveen. At the hand of the creative dribbler Heerenveen put six past the reigning champions.
Earlier that week: Twente – Tottenham Hotspur 3-3.
Or a structural price to pay for competing at the highest level of European club football? Of course, picking a few examples to illustrate a case is nowhere near where you want your research to be, but these matches did trigger the idea behind the current article. Let’s look at the performances of the Dutch clubs competing in the Champions League and compare the results in the immediate post-CL Eredivisie matches (if played within five days) with the results obtained in Eredivisie matches that were not preceded by a CL match.
For comparison, the results obtained by teams competing in the Europa League will be thrown in too. Ajax’ matches in the Europa League during the later stages of the 2010/11 tournament were considered among the CL group as the advanced EL tournament is considered to represent a comparable challenge to the CL group stages. Matches involving two teams that both played in either the CL or the EL earlier that week were considered among the non-CL/EL group as the effect of the European football match was considered to be cancelled out.
Over the past three seasons four Dutch clubs participated in the Champions League: Twente (2010/11), Ajax (2010/11), AZ (2009/10) and PSV (2008/09). Among those, only Ajax in the recent season ran out winners of the Dutch league, while the other three clubs finished 2nd (Twente), 5th (AZ) and 4th (PSV), respectively.
The four CL participants finished on average on 67.8 points (or 1.99 points per game, PPG), while the EL participants finished on 60.9 points (1.79 PPG).
The CL participants played on average 8.3 post-CL matches, while the EL participants played 6.8.
The average PPG results for CL and EL participants are shown in the graphs below, split out between matches within five days of European football and matches not preceded by European football in the five days before.
Surprisingly, the results contrasted sharply between the Champions League and Europa League contenders. While the teams participating in the CL produced a lower PPG (-0.25) in league matches shortly after European football, the teams participating in the EL actually managed a higher PPG (+0.29) in those matches.
The effects were more pronounced in away league games compared to home games with CL contenders managing -0.14 PPG in home and -0.44 PPG in away matches and EL contenders +0.22 PPG in home matches and +0.42 PPG in away matches.
This small study on the effects of competing in Europe on the results of domestic football comes up with some surprisingly different results for Champions League and Europa League football. The data, of course, do not tell what might be the cause of this phenomenon, if it is at all a real effect and not induced by the relatively small sample size.
If we assume that it is indeed a real effect, then the positive effect of EL matches suggests a positive stimulus by those matches, while the negative effect of CL competition on domestic results suggests a burden induced by competing at the highest level.
If we compute the expected points effect over a season, the average of 8.3 CL matches would mean 2.5 points dropped, while the average of 6.8 EL matches would mean 2.2 points won. With the past two seasons decided by two points and one point respectively, in a league as tight as the Eredivisie this might just make the difference between winning the title and just falling short.