Sweden striker Viktor Gyokeres is expected to complete a move to Arsenal from Sporting this weekend.
BBC Sport has previously reported a £63.5m deal was in the final stages, with the move only held up because of negotiations between the clubs over add-on payments.
The 27-year-old has been given permission to travel in order to complete his medical and is expected to sign a five-year contract and officially become an Arsenal player in the next couple of days.
The Arsenal squad is in Singapore on the first leg of their pre-season tour of Asia.