Ronny Deila added two more loan players to his Celtic squad then revealed the frustrations and problems behind arranging permanent deals. Belgian defender Jason Denayer, 19, has arrived on a season-long loan from Manchester City along with Aston Villa's Bulgarian international winger Aleksandar Tonev.
Aside from snapping up out-of-contract keeper Craig Gordon, Deila's only other signing this summer has been forward Jo Inge Berget on loan from Cardiff City.
The Scottish champions are cash rich following the sale of England keeper Fraser Forster to Southampton for a fee of £10million at the weekend but Deila, looking forward to Celtic's Scottish Premiership opener against Tommy Wright's St Johnstone at McDiarmid Park tonight, insists it is not so easy to buy players.
"There is money available and when I feel it is right to use it, I will use it," said bossman Deila, who revealed he had missed out on Nancy attacking midfielder Jeff Louis who opted to sign for Standard Liege.
"I have money to spend and that is the most important thing, but if we buy a player for £10million what do you think the salary will be? It will be five or six times more than you get at Celtic.
"If we pay that, what will happen to the other players? You have to see the big picture. It is not about the fee, it is about the salaries.
"The money from television in the English Premiership is huge.
"Celtic is unbelievably huge but the money (here) is not so huge.
Celtic are desperate for a good result tonight ahead of next week's crucial Champions League play-off first-leg against Maribor.