Laurent Koscielny's late header salvaged a 2-2 draw for Arsenal in their Emirates Cup clash with Napoli, but the Gunners' inconsistent performance will have strengthened Arsene Wenger's desire to improve his squad.
Wenger has so far failed to land any of his main transfer targets, including Liverpool forward Luis Suarez, and the frailties shown by a familiar looking line-up as the home side fell behind to first half goals from Lorenzo Insigne and Goran Pandev provided cause for concern.
To make matters worse, Arsenal striker Lukas Podolski saw a penalty saved in the opening 45 minutes of the four-team pre-season tournament.
But Gunners boss Wenger could at least draw comfort from a much improved second half display that was capped by Olivier Giroud's goal and then Koscielny's equaliser in the final minutes.
Gonzalo Higuain's presence in the Napoli squad served as a reminder of Arsenal's failure to recruit during the close season, with the former Real Madrid striker opting for a move to Italy ahead of a switch to the Emirates Stadium.
Wenger's focus has since switched to Suarez, but while a forward has been his priority, the way his defence performed during the opening 45 minutes served as a reminder of weaknesses elsewhere in his squad.
Both goals came as a result of poor defending and with Napoli repeatedly threatening on the break, there was much concern for Wenger.
This display will only encourage further interest in defenders as Insigne's third-minute opening goal came from an individual error by Carl Jenkinson.
The Gunners right back inexplicably attempted to head a floated through ball back to keeper Lukasz Fabianski but succeeded only in looping the ball into the path of the Napoli winger who volleyed home from close range.
Arsenal's soft centre was then exposed once more in the 28th minute when Marek Hamsik was allowed to advance unchallenged deep into the home half before releasing Pandev.
The Macedonia striker drifted away from Per Mertesacker far too easily and rounded Fabianski before chipping the ball home.
In between those goals, Podolski had the opportunity to bring Arsenal back into the game from the penalty spot after Valon Behrami had brought down left back Kieran Gibbs.
However, the Germany international failed to take the chance, striking the ball too close to Pepe Reina, who marked his first appearance back in England since his acrimonious loan move from Liverpool with a comfortable save.
Reina later saved well from Per Mertesacker's header, while Jack Wilshere came close after the break with a right foot shot after a fine run.
Arsenal were finally rewarded for their improved second half showing when Giroud met Theo Walcott's left wing corner with an acrobatic overhead kick in the 73rd minute.
Koscielny then claimed the leveller with three minutes left, following up after Reina had saved from Mertesacker.
Earlier in the day, Galatasaray beat FC Porto 1-0 thanks to a 70th minute Felipe Melo penalty.
Porto, meanwhile, twice missed from the spot, first through Jackson Martinez and then Lucho Gonzalez.