Alexis Sanchez back in London as Arsenal star poses for photo with pet dog on Friday afternoon

Alexis Sanchez landed back in London on Friday afternoon after a summer break

Arsenal are concerned that Sanchez may not be ready for their Premier League opener

MANCHESTER UNITED ARE SET TO SIGN PAUL POGBA FOR £100M

Juventus' Paul Pogba is set to be Mourinho's fourth summer signing at £100m

Pogba left Old Trafford on a free transfer in 2012 after a lack of first-team opportunities

Pogba (centre) as a young boy alongside his older brothers Florentin (left) and Mathias

Pogba took his mother Yeo as his guest to FIFA's Ballon d'Or gala in January

Pogba took his mother Yeo as his guest to FIFA's Ballon d'Or gala in January