Chelsea have matched Liverpool's bid for England star Glen Johnson.
Portsmouth accepted a £17.5million bid from Liverpool earlier this week and the 24-year-old looked set to seal a move to Anfield.
However, Pompey chief Peter Storrie has confirmed the club have also now agreed terms with Chelsea - Johnson's former club.
The in-demand full-back now has a decision to make, with both sides keen to tie up a deal this week.
"The matter will come to a conclusion at the beginning of next week. I do not have a preference over the move, it is up to Glen," Storrie said.
"The deals are almost identical so it really is down to him and what club he prefers, which one is going to pay him more money.
"Glen wants to play regularly in the Champions League, he has got himself back in the England side so I understand that. Sometimes you have to be fair to players."
Storrie admits that Johnson needs to be playing Champions League football next season in order to secure his place in Fabio Capello's starting XI - with the World Cup finals now less than 12 months away.
"It's a big year for him with the World Cup coming up," he continued.
"Playing Champions League football will make him an even better player than he is today."