Poyet is keen to retain the duo for the coming season, but fears for his squad as the transfer window reaches a climax.
Poyet said, “The last day of the transfer window is terrible. You don’t want to answer your phone or check your emails. You don’t want anything unexpected.”
With Fletcher expected to lead the line on the opening day, Poyet added, “I think it will be his year, I am absolutely convinced.
However, Poyet has revealed that Wickham could leave the club if a new deal is not agreed, with the 21-year-old entering his final year on his current contract.
“For me, I think he is going to stay with us. It’s tough because I would like to know that from now on, I would love to concentrate on the games and that’s it.”
It is thought that Wickham would be available for around £8 million, if Sunderland agree to a sale.