Lambert says he will now wait until the summer before deciding what happens to loanees Bojan Krkic and Giannelli Imbula.
“We spoke about the lads and what we thought was the right thing to do," said Lambert.
“The lads are playing at the minute, which is good, and I will probably get round to that at the end of the season.
“But at the minute, we have a big squad here as it is. The loan lads, I'm pretty sure, want to keep playing.
“We've got 14 games to go and we are going to need everybody ready for it."