diff --git a/src/sage/categories/drinfeld_modules.py b/src/sage/categories/drinfeld_modules.py
index 08613d2d14a..cd20e656f05 100644
--- a/src/sage/categories/drinfeld_modules.py
+++ b/src/sage/categories/drinfeld_modules.py
@@ -23,10 +23,12 @@
 from sage.categories.homsets import Homsets
 from sage.misc.functional import log
 from sage.misc.latex import latex
+from sage.misc.lazy_import import lazy_import
 from sage.rings.integer import Integer
-from sage.rings.polynomial.ore_polynomial_ring import OrePolynomialRing
-from sage.rings.polynomial.polynomial_ring import PolynomialRing_general
-from sage.rings.ring_extension import RingExtension_generic
+
+lazy_import('sage.rings.polynomial.ore_polynomial_ring', 'OrePolynomialRing')
+lazy_import('sage.rings.polynomial.polynomial_ring', 'PolynomialRing_general')
+lazy_import('sage.rings.ring_extension', 'RingExtension_generic')
 
 
 class DrinfeldModules(Category_over_base_ring):
diff --git a/src/sage/rings/function_field/all.py b/src/sage/rings/function_field/all.py
index 5557bbb349f..455fa9fe19e 100644
--- a/src/sage/rings/function_field/all.py
+++ b/src/sage/rings/function_field/all.py
@@ -1,2 +1,5 @@
 from .constructor import FunctionField
-from .drinfeld_modules.drinfeld_module import DrinfeldModule
+
+from sage.misc.lazy_import import lazy_import
+
+lazy_import("sage.rings.function_field.drinfeld_modules.drinfeld_module", "DrinfeldModule")
diff --git a/src/sage/rings/polynomial/polynomial_ring.py b/src/sage/rings/polynomial/polynomial_ring.py
index 74e6b061a09..93def2b7ad1 100644
--- a/src/sage/rings/polynomial/polynomial_ring.py
+++ b/src/sage/rings/polynomial/polynomial_ring.py
@@ -166,8 +166,6 @@
 import sage.rings.abc
 from sage.rings.fraction_field_element import FractionFieldElement
 from sage.rings.finite_rings.element_base import FiniteRingElement
-
-from .polynomial_element import PolynomialBaseringInjection
 from .polynomial_real_mpfr_dense import PolynomialRealDense
 from .polynomial_integer_dense_flint import Polynomial_integer_dense_flint
 from sage.rings.polynomial.polynomial_singular_interface import PolynomialRing_singular_repr
@@ -679,6 +677,8 @@ def _coerce_map_from_base_ring(self):
                       To:   Univariate Polynomial Ring in x over Rational Field
             sage: R.coerce_map_from(GF(7))
         """
+        from .polynomial_element import PolynomialBaseringInjection
+
         return PolynomialBaseringInjection(self.base_ring(), self)
 
     def _coerce_map_from_(self, P):