Huh? Of course you can. And you can replace "can" with "should".
Being interested in a player & reaching an acceptable agreement is good business.
Being interested in a player & paying whatever the other party wants is flat out retarded.
Besides, we've all heard it before, haven't we?
"We should just pay the difference & sign Krasic immediately." No, apparently we shouldn't have back in the day.
"We should just pay the difference & sign Aguero." No, apparently we did not need him to reach our goals. Not to mention he'd have cost us about the same as our entire strike force combined. Would be fun though to play a season with one striker.
Edit: I think Jovetic will be a Juve player in the end.