Steve Bruce has reiterated his desire to sign Nedum Onuoha and Danny Welbeck permanently, but will be guided by their parent clubs' wishes.
Defender Onuoha is on loan at Sunderland from Manchester City and striker Welbeck is enjoying the season at the Stadium of Light from Manchester United.
Both players have impressed for the Black Cats and manager Bruce has not hidden his desire to keep the duo in his squad on a long-term basis.
Bruce has praised the pair's contribution during their time on Wearside and is remaining patient in his quest to secure a permanent arrangement.
"The one thing I have got to do is be respectful to their two clubs," said Bruce.
"They are two young players and the one thing they have benefited from is playing here, and that was the big thing.
"Especially loan players you bring in who are not yours, you want them to come into the group and they want to make an impact.
"Being here has certainly done that for the pair of them, Nedum with a wonder goal at Chelsea, and Danny Welbeck in the last couple of games in particular has been outstanding.
"His contribution at Chelsea and his contribution against Everton was that of a young player who is full of confidence and who is enjoying football and is enjoying the challenge.
"I have to say they are both great lads as well. They are just the type you would love to bring to your club and make them permanent if you could.
"Whether that's possible, we will see."