Neither was a regular starter in the first half of the campaign but they have finished the season strongly and were voted first and second in the April's Player of the Month poll.
Ramsey pipped Koscielny to the prize and Wenger is delighted with both players.
"Koscielny at the start of the season was not a regular player. Ramsey for a while was not in the team," he told Arsenal Player.
"If you keep going, if you have that stamina and persistence in your attitude, at some stage you will be rewarded.
"Certainly their outstanding performances have been noticed but as well the quality of their spirit has been rewarded by our fans."
Arsenal to win @ 1/3