The Reds won both friendlies versus the La Liga club on Monday evening, with the first game ending 4-1 and the second 3-2 in the hosts' favour.
The matches marked the end of the Premier League champions' pre-season programme, with the FA Community Shield at Wembley to come on Sunday.
See previously unseen footage and behind-the-scenes moments from the victories over Athletic in the YouTube video below.
