Arsenal coach Arsene Wenger will be without right back Mathieu Debuchy for a "longer period" of time and is struggling with defensive options for their Champions League group opener against Dortmund.
Liverpool produce an irresistible performance to dismantle a toothless Tottenham Hotspur 3-0 and Arsenal were held 1-1 by Leicester City in the Premier League on Sunday.
The Frenchman has failed to bring in any of his top targets in the close season and said he is still in the market for some new talent before Monday's transfer deadline.
Cristiano Ronaldo renewed his personal battle with Lionel Messi by scoring his 71st Champions League goal, putting him three behind the Argentine's newly-set record, in Real Madrid's 1-0 win at FC Basel on Wednesday.