Arsenal are on the verge of signing Sporting striker Viktor Gyokeres after negotiations over the finer details of the transfer took longer than expected.
BBC Sport reported last week a 73.5m euro (£63.5m) deal was in the final stages, with Arsenal hoping it would be done for the beginning of their pre-season tour of Asia, which starts on Sunday.
However, the move for the Sweden forward has been held up because of negotiations between the clubs over add-on payments.
Gyokeres has already agreed terms and a five-year contract with the Gunners.
The 27-year-old has been in demand during the summer transfer window after scoring 54 goals in 52 games for Sporting last season.