The Arsenal manager says the Chilean's move to the right wing has profited the player.
Rangers beat Celtic on penalties in the Scottish Cup this afternoon.
The Celtic goalkeeper reveals his tactics did not pay off as his side slipped to defeat to Rangers at Hampden Park.
Eric Black has taken caretaker charge of the club's last three games following Remi Garde's departure and the suggestions are that the board could wait until the end of the season to find a permanent successor to the Frenchman.
Sunderland and Crystal Palace are reportedly keen on Lorient forward Benjamin Moukandjo.
Referee Jonathan Moss had an eventful afternoon today.
Liverpool won against Bournemouth in the Premier League on Sunday.
Newcastle United won against Swansea City in the Premier League on Saturday.
Vladimir Weiss stuck the boot into Celtic's Scott Brown for his role in Rangers' opener during the Scottish Cup semi-final.
Chris Wood admits it was tough being on the sidelines but says he finally feels up to speed again after a recent run of games.
Ibrox side Glasgow Rangers are due to meet Celtic in the Scottish League Cup later today.
The 20-year-old impressed for West Ham United on Saturday.
Tottenham Hotspur could only draw with Bournemouth on Saturday.
Liverpool are the bookies' favourites to sign Steven Gerrard, with Celtic second on the list.
Liverpool beat West Bromwich Albion 2-1 at Anfield.
The England international again had a poor game in the Premier League.
The German has replaced the Belgian goalkeeper as Liverpool's number one this season.
Paul Dummett appears to have established himself as Newcastle United's first choice left-back.
Newcastle United and Crystal Palace are reportedly keen on Celtic defender Jozo Simunovic.
Arsenal and Middlesbrough played out a goalless draw this weekend.