Giovanni Trapattoni praised Robbie Brady for his impressive Republic of Ireland debut, but warned the 20-year-old that he must be playing regular first-team football to make the national team on a regular basis.
Brady, 20, has not played for Manchester United, but he showed glimpses of pure class at Craven Cottage on Tuesday night, setting up two goals and scoring one himself as the Republic eased to a 4-1 win over Oman.
"I think Brady played well in the first half," said Trapattoni. "He scored a goal also and I think he can also do better. He might be called up in to the squad for the next match, but he would not necessarily be in the team (if he isn't playing regularly). This is a problem we have in our team, that five or six players only usually play 30 minutes or so every week."
The Republic put in one of the worst performances of Trapattoni's reign on Friday night as they scraped a 2-1 win in Kazakhstan thanks to last-gasp goals from Robbie Keane and Kevin Doyle.
Trapattoni made 10 changes to his team and the result was a much more fluent performance on Tuesday, with Doyle, Shane Long, Seamus Coleman and Brady all impressing.
Trapattoni has often come under fire for being too conservative during his time as Republic boss, but his team threatened from all corners of the pitch and the Italian was happy with the performance of a number of his players.
"The victory is important for us," Trapattoni added.
"We made a lot of changes, but we played technically well. Brady was good, David Meyler played well and James McCarthy impressed me with his personality and so did Seamus Coleman."