Reading goalkeeper Adam Federici has taken to Twitter to apologise for his crucial gaffe in Saturday's FA Cup semi-final defeat to Arsenal. With the game finishing 1-1 after 90 minutes, the Australian inexplicably let a tame Alexis Sanchez shot slip through his grasp in the sixth minute of extra-time and could only watch on as it trickled over the line, allowing Arsenal to book a second successive final appearance. The 30-year-old, who was 'inconsolable' after the match, has received unwavering support from his manager and team-mates but issued an apology to Reading's fans. Adam Federici tries in vain to stop Alexis Sanchez's strike from going over the line in Saturday's FA Cup game . Sanchez (centre) celebrates making it 2-1 to Arsenal as Federici (second left) is left dejected after his error . 'Just like to say thank you for all your messages and how sorry I am for my mistake, we gave our all and deserved to at least take it pens,' he posted on his official Twitter account. 'It's part of being a goal keeper and I'm sure it will make me stronger ! Thank you again for your amazing support £readingfc.' Steve Clarke's men, in the lower reaches of the Sky Bet Championship, forced extra-time after Garath McCleary's second-half volley cancelled out Sanchez's opener.
Adam Federici lets Alexis Sanchez's extra-time effort through his legs .
Sanchez's goal made it 2-1 to Arsenal who will now play in the FA Cup final .
Federici left inconsolable after error but says he will come back stronger .